Hi Jens, Are your ECU power and ground wire connected directly to the battery? They should be - and should be routed away from other wiring. Until the learning problem is fixed, there's not much more that can be done. You could check the plug side electrode coloration to be sure you have the correct heat range. The rebooting issue could be the handheld cable. But, it might also mean you need to add a filter capacitor between the pink ECU power wire and a good ground. If you need the filter, moving the pink wire to direct battery power will not help. A small 50 volt or better 82 Pico Farad non-electrolytic capacitor will usually do the trick.