can't really see the errors,
but there's a few possible reasons.
1: Zaypay are doing something, (update/faliure/downtime/m.m)
2: someone figured out how to re-edit your scripts from the outside (changing something that make an script file go corrupted)
3: Someone found a bug that's weak for attacks, etc Dos/DDos and are trying to harm you through this bug, that in this case are located in your donation scripts.
Donatescripts for daopay, paypal and zaypay are very often VERY weak, because the ones releasing the scripts didn't know how to secure them properly.