I'm using Cokeman's 2.31 unlocker, Sprint Leaked ROM (3.02) with the PPST.exe fix, with tons of apps loaded and my Vogue has never skipped a beat. I really liked my Mogul but I love my Touch
I really think that you must have a defective phone, and should promptly bring it back for an exchange. Either that or you are using an unstable ROM, but I am assuming you are using the original ROM?