BES Folders Spontaneously Not Syncing

[HofstraJet]

I have a BB 9700, OS 5.0.0.415 on TMO activated on my corporate BES. Been working fine for years. For the past few weeks, at random times I would stop getting BES emails. When I would check my office desktop's DM settings, the folders selected for sync would all be unchecked. I would recheck the folders I want and it would work again for a few weeks and then the same thing occurs. Keeps happening. Help Desk is blaming my BB, but I can't see how my BB can change sync folders (I cannot select which folders to sync from my BB that I know of - is there a way to do that?). It is inconsistent which folders get unchecked - sometimes just inbox, sometimes inbox and all subfolders so I have to recheck the subfolders I want, and sometimes sent items).

Please let me know if you have heard of a similar problem or if you have any ideas for a fix.

Oh, and I have had the 9700 with this OS for a few months - the problem only started very recently.

Thanks!

PS - office desktop is running DM 4.2.2.14 (I know it's ancient, but the company is slow with updates if not necessary)

[Mark_Venture]

Take a look at the release notes for some of the recent BES Service Packs and MR's...

I thought there was an identified issue, and fix in one of them...

[afall]

Does it happen when you open DTM? Or maybe when you close DTM? Could be a compatibility issue with DTM. Upgrade to the latest one or try not keeping it open at all and see if the issue goes away while closed.

[HofstraJet]

It doesn't seem to have a relation to DTM as the unchecking of the folders happens at random times, many times in the middle of the night when I am not at the computer. I keep DTM closed and only open it when I need to (which was never until this problem started).

I found this KB article which my help desk is following up on: http://www.blackberry.com/btsc/search.do?cmd=displayKC&docType=kc&externalId=KB18 549&sliceId=2&docTypeID=DT_SUPPORTISSUE_1_1&dialog ID=21788772&stateId