Clock on Atrix HD is slowing down, not sycn time correctly

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http://forum.xda-developers.com – My Atrix HD is having problem have the clock sync with real time. It is always slowing down and therefor not being accurate and alarm can't be used reliablely. Tried manually set the time and use the network time, both give the same problem. Any solution? This seems to happen after I switch the data plan from 300mb to pay-per-use and my mobile data is disabled including the background mobile data, since this phone is always on WiFi only. Thanks! (HowTos)