So my Fairphone 4 running /e/OS 2.8 has been having some issues lately - it suddenly shut down about two times and I was only able to restart it after charging it for some hours. I thought it was a battery issue so I bought a new battery, but today with the new battery it suddenly shut down again and now it won’t turn on at all. I’ve tried both batteries, taken the battery out for a long time and so on, no success.