Although carriers may delay text messages for a while i doubt it would be days. Also dropped calls can happen on any carrier. Because you seem to be having radio receive issues, it may be your blackberry is not receiving a signal and if so the data will be delayed until it can send to the phone.
Check to see if you have a good signal when you get a chance and try to notice. Dropping calls also indicates a bad reception.
Worse case the phone is having issues. You might be able to reload the OS with an updated version and see if it clears the issue. Some older versions of OS did have some radio problems.
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Z10 on BES