Given you are paying for a car that breaks down and unresponsive, leaving you stranded, it is a faulty car.
Complain about the faults and how you do not feel safe when it dies. The way the scheme works is not renewing a faulty vehicle, but ending the lease.
A few people have reported similar problems with the ex30, it is a lottery id you get a good one or a bad one. Probably wiser to look at another car, rather than the ex30.