I am hoping someone may have come across this issue as we have been working on it for over 4 months now.
We have a terminal server (Win2k8) all remote users working from a Windows XP computer do not have this issue, it has been since we purchased some Windows 7 PRO notebooks this issue has developed. We first thought it could have been something to do with 64bit edition of windows so this was changed to 32bit with the same issue still persisting.
Whilst connected to RDP we are getting getting sessions that just freeze up and popup a dialogue box saying reconnecting (this mainly happens if it is minimized then maximized), also more often are recieving a protocol error or decompression error.
Again this only seems to happen to users that have a Windows 7 notebook, we have been banging our heads againtst the wall trying to work this out.