You mention it started for you Aug 10 which coincides with the beta release of the current patch. I'm not sure from your post if you think this is patch related? FWIW my game is fully patched and I am not having the issue you describe.
What are your league settings for pitcher rotation size and stamina?
My league is..
League Settings>Stats & AI..
"typical starting rotation size" 5 ( With the screenshot I'm wondering if this setting got changed to 4?)
"Pitcher stamina" Low (If RP are recovering faster too I'd look at this)
Perhaps something glitched when you patched and these settings changed?
Only places I can think of to check. Hopefully it is of some help.
