It seems that 500 errors have been stabilized, so there shouldn't be any more issues!
Monitoring · UTC
The hosting managed to get a resoanable load and it's currently monitoring the result.
Identified · UTC
Currently, 500 errors are frequent in Scheduled Exams and Maicol07 Account. It is caused by server high load. The hosting says it needs a week or so to balance. This incident will continue to be monitored