If it loses it's satellite constellation it can take 30 minues to get going again.
I haven't tried it but:
Hard Reset:
With the unit turned off, press and hold the follow buttons: PAGE + Enter on the click stick. Then press and release the POWER. The unit will power up asking if you want to release all user data. Select yes, and the unit will be reset.
After the master reset please place your unit outside, so that it has a clear view of the sky for 25 to 30 minutes for the unit to acquire new almanac data.
If you have a problem & think that someone else is going to solve it for you then you have two problems.
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