Pages and components not saving

[gra]

Health check shows no problems and write permissions are ok, but I have just discovered my hosting company switched from Apache to Litespeed server without telling me around about the time this problem arose. Over the last 10 days all I have been able to get out of then is "The problem with the webpage coding that can't be parse by the server" and "Senior staff are looking into the matter". They now appear to be ignoring me, presumably hoping I'll go away. Do you think the server change could be causing this issue, and is there anything I can do from my end?