SSAS cube role members magically disappear overnight

Hello,
We are running SQL Server 2008 SP1 CU4 and I have been experiencing an occasional issue whereby our cube role members disappear - resulting in the user-dashboards failing on our website, so I am keen to resolve this.
Some background:
-We have two roles, one with 2 members and one with about 15-20. When the issue occurs, both roles lose their members but the roles themselves remain.
-The SSAS database is set to do a full process every night at 11pm.
-I deploy cube changes by backing up the cube from my development machine, and restoring to the server. My dev machine is on a different Windows domain. When I restore I select "overwrite security information" but am always very careful to select
"Skip Membership". The restores always complete successfully, and I can immediately re-process the cube and confirm that the original members are still there and functioning normally.
-I suspect that this issue is related to the nightly re-process of the database, however I have tested this theory by checking the membership the day after I've completed a cube deployment and everything is still Ok.
-This just happened again last night. I reviewed the server logs and saw that the server rebooted last night at 9pm, followed by the cube re-process at 11pm.
-I noted this morning that the role membership has a single SID listed, and I can confirm that this is the SID of my local user account on my local machine. So it appears that when the issue exhibits itself, the cube is reverting back to the role membership
contained in the restored database, even though I told it to skip membership.
To fix it this morning, I re-added the members and have saved a script to automate the process next time it occurs. I am aware I could run this script after every re-process just to be safe - but I'd rather stop unpredictably losing the configuration
than automate the re-establishment of it!
What gives!? Any suggestions appreciated.
Michael

Hi Abbas,
We're clear on the difference between "build" and "process" right?
In my case, the cube processes every night - whereas we only change the design of the cube occasionally, maybe once every 2-3 months - therefore we are only
building it every 2 or 3 months.
Because my dev machine is on a totally different domain to the SSAS server, I can't (or at least I didn't think I could) specify the accounts that are members of the various roles during development. I do this with the aid of a script every time we
deploy out a new version of the cube to the SSAS server.
So, after a build and deploy - the cube role membership is perfectly fine and behaves as expected for all users. The thing that's puzzling us is that the role membership occasionally appears to unpredictably revert to prior settings (i.e. reverting
back to my deployed role membership config prior to running my script to set the correct role membership).
The cube can be running fine for several months and then suddenly I get a call in the morning about users not being able to access the cube. I find that the server was rebooted overnight and the role memberships have disappeared - this is not an immediate
result of a BIDS build/deploy as I think you are suggesting Abbas.
This hasn't occurred again since my last post in March this year, fingers crossed the problem has gone away.
Thanks,
Michael

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