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Faulty Bee Bot Junior School educational robot

Been asked to fix some faulty Bee Bots by my local Junior School. These are simple programmable robots from here:

The Bee Bot is programmed with a series of commands by pressing buttons for Forward, Backwards, Turn Left, Turn Right and then pressing the execute button. The battery is well charged and I've tried swapping with a known working Bee Bot. Three of these Bots will only run through three commands before resetting itself. I've tried running them lifted up so that there is no movement and it still stops after about 8s. Not sure this is, therefore, a poor connection.

I've found this unofficial service manual, but this fault condition is not covered.

Has anyone else tried to fix one of these? Any ideas welcome.
 

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