Loss of carrier signal, unable to get it back until I restart my iPhone 4

I received my unlocked iPhone 4 from the online Apple Store yesterday. Overall, I haven't noticed the death-grip issue. I think.
However, I've seen the following happen twice today while at my office:
- After carrying the phone in my back pocket for some period of time, I take it out only to discover that there is no carrier info available (no "Fido" tag, no signal-strength bars).
- No matter how much I wave the phone around or wait, I never get a signal even where I previously had full-signal strength.
- I look in Settings and the "Carrier" option is no longer there, so I can't even scan for Fido's network.
At this point, I have to restart the iPhone. Once it restarts, everything seems to be normal again. I get a full-strength indicator and the "Carrier" option is now once again available in the Settings menu.
Has this been reported before? An Apple rep installed the microsim card yesterday during activation, so I'm wondering if the SIM card just needs to be re-seated? (I don't have my SIM-eject tool with me at the moment.)
Would appreciate any help with this!

I had a similar problem when I was on holiday on Cyprus. The first day I had a connection. The second day, when I turned my iPhone on, I wasn't able to connect to any provider though the providers were listed. I tried several things (reset phone, reset network settings etc.) but nothing worked.
Then suddenly a few days later, my iPhone connected to the local network! The next day I deliberately turned off and on my iPhone again and the problems were back. However, after a few tries manually selecting a provider, I had a connection again. I asked my telephone company in the Netherlands what the problem could be, but they had no answer.
When I returned home, everything worked fine again. I also tested my iPhone in Germany and it worked OK there as well.
So, I don't know what happened on Cyprus and I can't reproduce the problem at home. I thought I share this because I'm still anxious to know what the problem was.

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