Hiya,
I'm a linux systems administrator & php coder with 15+ years experience and I've seen these type of issues with WP before, and I reckon I can solve it very quickly. I can start straight away. I can give you about 5-6 hours of my time to deal with these things for this bid price.
Basically there's a defect in WP's handling of scheduled tasks that needs fixing, and I think it's that. Beyond that optimisation I can also help tune up your database, underlying OS, etc so that you're well set for the future.
Indeed, I specialise in just this sort of esoteric and tricky linux stuff, to the extent my customers say for example:
"Thank you, you're a God-send".
Josh Strike - Strike Sapphire
"Thank god for you being available, dont know what we would do if you were not around."
Matt Norris, Strand International / Easy Play Poker
Yours,
Kev Green,
oRe Net.