HI Firdaush - Are you inquiring to something specific? Anything you want us to look at that you may be having a problem with? Let us know, and we can try and see whats up.
There are usually a few caveats listed in the release notes of any given version:
For 2.3 it looks like there's an issue with quickly holding after a resume, as well as DTMF tone suppression.
There are a couple of issues from 2.3(1.55) which are fixed in 2.3(1.57), and there is also a 3.0 release now available which corrects some further issues - these are all documented in the release notes, but you can also get a complete list of known bugs from bug toolkit / the bug search tool.
HI Firdaush - I'll have to check some things and get back to you on that one. Could in theory be network related as well for the fact that the TS received that many fast update requests and its constantly sending picture updates to the CTS. Let me check around a bit more and get back to you.