Key thing Mb said is “If you want to” So I guess you have the options of waiting longer and see if they can fix it.
The problem might come back again and it seem’s right now they don’t know what it is, suggests it’s maybe some sort of programing/code issue as they seem to be the common problems they cannot find or fix.
A new firmware update may solve the issue.
It’s not nice what happened and in the back of your mind will be, will it happen again and that makes you lose all confidence in the car. If it has then it might be best to get something else. Although right now that’s not so easy and the longest waits seem to be for EV’S.
You will get any ap you paid back pro-rata and if you had the car for over a year you will get £250 gcb, 2 years £400.
If you do cancel the contract, where doe’s that leave you till your next car arrives? Might be another factor in you decsion.