I dont know whether this is related to the topic or not, but I found worth mentioning it here.
Me too using 755p since Oct-08 (bought from Sadik). After struggling hard for a month I gave up & started using R-connect after resetting radio by ##000000# & clicking "Cancel" regularly. The connection also used to go dormant when idle for even a few seconds & then it takes a while to become active (Green) again & you cant surf while it's Dormant. But I left bothering it as I loved this piece of tech 755p & PalmOS5.
But since a month or so I noticed both these issues are gone & forever. Nowadays it connects without resetting radio. It does go dormant (Grey), but comes up active (Green) as soon as you click a link or fire up a request.
This may be b'coz I think Reliance guys are up with huge upgradation on their Data services (My Guess!), before they could mass market EVDO on phone, which is much awaited.
To mention, I had both these network connections in my 755p connection profiles, but to no help till this happened.