Why the serial go bad every 5000 seconds

[Eric <shumybest@xxxxxxx>]

The problem troubled me very long time.
My platform is:
ARM9 (S3C2410) with 3 serials
Linux 2.6.14.7
GPS (Oncore M12T)
I used the serial to receive the GPS data. The data comes smoothly every 1 second. That means , the serial should receive the data every 1 second. But when the serial have received about 5000 seconds ( nearly 1.25 hours), it goes bad .First , the next data will late for nearly 1 second, and then the following data comes just 0.2 delay for chasing the previous data. After some time , it goes to normal and it happens every about 5000 seconds periodically.
Buddies, What makes this happen or How does it happen?
The Kernel or The Drivers? I don't think there's some problem with serial drivers.
The hardware is ok, I've tested it many times and this problem also happens on my X86 ubuntu with kernel 2.6.18, it just better than the arm cause it comes about 10 hours.
Thank you everybody
 
 
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