I have the same problem. Today i have sent my phone in for service/repair in the shop i bought it from. I can update in this thread what they find out. The worst thing about this problem is that it pretty common. If you search "Xperia camera error" on Google, you will find out that this problem has been for years on Xperia phones. I will never buy a Sony phone again.
I also had my motherboard replaced for a different problem though (main microphone was disfunctioning, I had thread on it) but I too got the occasional message of Camera error. Since the replace I never had that problem again.
Update 2: It work for like 3 days, now the problem has come back. I have sent it in for service for the second time. The first time they changed the motherboard, camera and installed the newest software. I have no idea what they possibly can do more!
Tips: Don't buy any Xperia phones before they fix the camera bug. I personally will never buy a Sony product again after this experience. The camera bug/fail has been on all the Xperia phones if you Google it.
Sent it in for the second time. They changed the camera and installed the newest software. It worked for about 2-3 days again. I got it refunded and bought myself a Samsung S10.
I have the exact same problem. Use the camera once and it no longer works.
I've performed a factory reset and started in safe mode and always the same.
It feels like it's an issue with the camera communicating to where ever the pictures are saved, but the same issue happens when I take the SD card out.
Android 10. I think it fries and overheats the camera phone see o it cant launch. Mine had gone to Sony repair twice cause of this. Problems occured since android 10.
I did notice back of phone gets hot with android 10.
