May I suggest you get on a more regular upgrade schedule?
The earliest support Moodle for bugs at this point is 3.9. Moodle 3.8 and 3.5 still get security fixes for now, but that's all. Moodle 3.3.9+ is minor update that should run pretty quickly. If you've hit a bug, it's possible that it might be resolved in that release. That would be my short-term suggestion.
Otherwise, you would need a programmer willing to try to track down what is happening and patch it somehow.
You really need to strike a balance between not wanting to upgrade and being on a supported release. Otherwise when you get a bug like this, you are just stuck. We run the previous supported release generally. Right now we are on 3.8.latest. We will upgrade to 3.9 after this term ends latest this month. Basically, you should plan for 2 upgrades a year to stay supported. If you plan for them, you can do them during less busy times in your schedule.
The earliest support Moodle for bugs at this point is 3.9. Moodle 3.8 and 3.5 still get security fixes for now, but that's all. Moodle 3.3.9+ is minor update that should run pretty quickly. If you've hit a bug, it's possible that it might be resolved in that release. That would be my short-term suggestion.
Otherwise, you would need a programmer willing to try to track down what is happening and patch it somehow.
You really need to strike a balance between not wanting to upgrade and being on a supported release. Otherwise when you get a bug like this, you are just stuck. We run the previous supported release generally. Right now we are on 3.8.latest. We will upgrade to 3.9 after this term ends latest this month. Basically, you should plan for 2 upgrades a year to stay supported. If you plan for them, you can do them during less busy times in your schedule.