I have just had my 2018 Clarity for a few months. Had to buy a used one because here in South Carolina I found it impossible to get a new one. Anyway I love my Clarity, but it is certainly not perfect and one of the major problems is that the computer can go crazy for no obvious reason. Maybe its stray radio waves or microwave radiation. Here's my story. From the first time I charged the car with my level 2 charger when it finished charging the charger display said 100%. Recently when the charging was complete the charger said "waiting to communicate" instead but the car was completely charged. Then yesterday after I charged it, the car refused to start and the dash was full of trouble notices brake failure, power steering problems, tire pressure monitoring problems and maybe more. I turned the power off and waited a couple of hours and tried again and nothing had changed. I disconnected the neg terminal on the 12 volt battery for several minutes and then reconnected and tried to start and it would not start. I attached a battery charger for 15-20 minutes and it started up and all the errors disappeared and the car drove fine. I took it in to the dealer this morning and they checked the 12 volt battery and it checked out perfectly, he said maybe even a little overcharged . I brought it home and attached the charger and when it finished the charger read 100% again. I'm used to having to reboot computers when any little thing goes wrong. In fact that is why you reboot computers periodically to prevent problems and keep things running smoothly. Does anyone think it is a good idea to disconnect the 12 volt periodically to prevent problems? If so I may install a cut off switch on the negative terminal to make it easy to do.