Basically you need to tell your boss to start budgeting for maintenance. The software that runs web sites is online 24/7 and under constant probing for vulnerabilities. This sounds like one or more parts of the host have an issue that needs to be patched or this will just keep happening.

Yup OP’s post history shows they’re trying to be frugal and get away with cheap plan + free public wifi, but free public wifi is usually insecure and doesn’t allow all services /protocols because it’s free !