Looks like they are dinging active sites on shared hosting accounts.
It is very common for shared hosting accounts to limit how many computer resources (CPU time and memory) a site uses. Otherwise a very active site could negatively impact other sites on the server.
The big question is how restrictive are they being.
An unscrupulous host will get REAL picky in an attempt to corral a site owner into a more expensive hosting plan, or even a dedicated server.
Of course, I have no idea at all if MindRaven is being fair or not. However, the fact that you have noticed sites banging their head against a limit that seems not to of been there before is an indication that they changed something. We can only guess as to a motive.
