Visvanath Ratnaweera

Is it a shared hosting? This is known to happen if the hosting package is too weak.

See similar discussions in the Hardware and performance forum https://moodle.org/mod/forum/view.php?id=596.

There is the "managed server", which usually means a dedicated (hardware) server running LAMP. The full LAMP stack, monitoring, network precautions, backup all are maintained. Not the applications. Everything Moodle-specific is yours. The cost is not comparable to shared web hosting, easily 20 times the price.

@Pete, otherwise, this is a recurring topic in the Hardware and performance forum. Run the advance search https://moodle.org/mod/forum/search.php?id=5 to find similar discussions.

I gave Nils the standard advice of https://docs.moodle.org/en/Debugging against the error in the subject. It is quite possible that the debugging at developer level brings unrelated errors and warnings to light.

So the second standard hint: There could be an unsupported/outdated non-core plug-in in the system, which escaped the hoster's (GUI) installation/upgrade mechanism.

Need to be mentioned that each https://docs.moodle.org/XY/, XY being the release, is a separate wiki. To edit them you need to login with the same credentials as on moodle.org, each wiki separately.

Ha, ha! "rm -fR something as root" sent me shivers!