Two weeks ago my wife parked and locked her 2011 LR2 while she went on a business trip for five days. Upon returning the battery was flat. She had it charged and all was well until today. Today she was driving at a normal speed and suddenly the car slowed down to approximately 10 mph and then stopped. She managed to start it but it would not go faster than 10 mph. We called the dealer and they had no suggestions. We had the car towed to the dealer. Has anyone had this same problem. She only purchased the vehicle in December 2015 from a Landrover dealer and this was a surprise to say the least. Most frustrating.

When she locked it and went away did she double lock (dead lock) it with the remote by pressing the button twice, if you dont the systems dont shut right down and you can end up with a flat battery?
By allowing the battery to go completely flat could ruin it too so afterwards its never at it best again.

Check the generator's output...

If it is the original battery it is probably worth replacing, after 4 years you are on borrowed time. Procrastination, mankind's greatest labour saving device!

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The vehicle will shutdown to the same level regardless of single or double locking, it just shuts down completely quicker if its double locked, 12 minutes as opposed to 35. I have seen mentioned that hands free phones in use when locking can keep the Bluetooth system awake preventing shutdown. 
Hung like Einstein, smart as a horse.

Well thats interesting because LR made a point of telling me make sure you always double lock it if you dont want to come back to a flat battery in a week or so time?

They should read their own workshop manuals



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Hung like Einstein, smart as a horse.

Thanks for all your suggestions. Since the problem is my fault, we have not yet discussed the subject of double locking. But I can guarantee she did not. The total shut down yesterday came after parking the car overnight. The fact that it started and drove for a short while before losing power would indicate an ECU problem? It is fairly cold here in the USA in DC, but this is a Landrover. I find it worrying that the local dealer has no idea what could have happened. It makes one wonder who trained the tech's.

I can't imagine what caused the shut-down while driving. That doesn't sound like a battery thing as the car will run off the alternator, so long as the battery is connected.
As regards flat battery, I take Shiggsy's point, but the problem has been much discussed on here and that has definitely been flagged as one of the problems. Just because LR says it will shut down doesn't mean that there may not be an electrical glitch that stops it working properly from time to time. I only had the flat battery problem once (on a MY07 diesel) and I'm pretty sure that was down to the car not shutting down after I used the boot (trunk) unlocking button. Other causes suggested have been Bluetooth as mentioned above and leaving the wipers/lights on auto.
Most of the instances discussed here were on quite early models. Yours seems a bit new for this problem. Ex AA Series III LWB Safari - Gone
300TDi Disco (bought new - terrible car) sent back after 18 months
Freelander 1 Estate - leased, given back at end of lease
200TDi Disco (bought from a mate with 100,000 on the clock) - Gone
Disco 2 TD5 - sold and exported to France
FR2 TD4 GS - Gone
FR2 SD4 HSE - Now changed for a DS
New model ex-demo Evoque S 180 in white
Unable to order a new DS, so gave up. Now have a Volvo S90 Recharge.

With a bit of luck we will know the cause of the problem on Monday. Car was transported last night to the dealer. Stay tuned and I will report back.

The outcome was that the dealer replaced the battery. However, the rub was that when they put the vehicle on the diagnostic machine they did not find any fault even with the battery. I passed on all your comments. They concurred that notwithstanding the diagnostics, the battery was probably at fault and that the car had gone into the crash mode when it slowed down. They had another name for this mode. 30 mph and not 10 mph. The chief mechanic concurred that the double locking was a requirement of the early LR2's but not the newer ones. They also suggested that perhaps the UK cars included certain 'features' not found on US spec' cars that required double locking. All very strange...........Thanks again for all your suggestions.

I have lived over here for a long time and this is my seventh LR. The Defenders are worth a fortune over here these days. If anyone has one over 25 years old and in good nick, you should consider selling it here.

Crash mode would make sense, although I don't see why that would have happened. The information about double locking is interesting. Not heard that before. Thanks. Ex AA Series III LWB Safari - Gone
300TDi Disco (bought new - terrible car) sent back after 18 months
Freelander 1 Estate - leased, given back at end of lease
200TDi Disco (bought from a mate with 100,000 on the clock) - Gone
Disco 2 TD5 - sold and exported to France
FR2 TD4 GS - Gone
FR2 SD4 HSE - Now changed for a DS
New model ex-demo Evoque S 180 in white
Unable to order a new DS, so gave up. Now have a Volvo S90 Recharge.