Default Time bug - WM6.1

Hi all

I live in Morocco so Time Zone configured on my computer and on my Trinity is "GMT - Casablanca".
Since I successively change ROM from WM6 to WM6.1, first wih netdrg then with mobiz, I encounter the same strange probleme :
Periodically, Time Zone change to "GMT - London" and minutes lost about 16 units....

I'm very confused. What can cause this problem.

Regards,

Blach

Edit : today I go back on WM6.0 (Faman Fr), my clock work well. Then I try the new netdrg ROM released today : the problem is back !
Am I the only one with this ? Known WM6.1 bug ?