Preventing Network wide changes

I have just spent most of the night fixing my network after all sites pages and setting's went AWOL. If all being well I will soon recover from it but taken all night, its the 5th time in weeks I don't have time to waste on this !

I'm now locking pages any other pages but need a more stable solution

I need to find a solution quickly so if my site goes it won't take down others !

Please advise