I think you could do with cleaning your registry out to deal with those "file missing" cases.

I would also remove BitCometHO.dll from your system and registry as this snoops on you.

XAUDIO.EXE - well I would suppress it. Better gurus than me would know whether there is something in there that kicks in to terminate a session - I rather think not, though you could look at your Internet settings in Tools - but you've already done all that I'm sure.

I couldn't see anything in the HJT that isn't covered above and, of course, we all lose the internet from time to time when the ISP glitches.