I bought a Kalkhoff endeavour about 6 months ago, and have experienced 4 times in that period that my ebike would not start up in the morning after having used it just fine the day before . Battery shows as charged & until now at some stage it starts working ok again. No rhyme nor reason when that will happen. My dealer has no idea what it is and cannot replicate the fault (sod's law that it has come on again by the time they have it in the workshop). I think it needs to be replaced under warranty. Has anyone ever experienced this problem?