Multiple interrupts

Sceadwian said:

Could you be sending and receiving at the same time and both interupt routines aren't able to process in a timely manner?

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Thank you for the reply. I added a start byte and stop byte and made some modifications in the code. Now the problem seems to be solved.

Headers (start bytes) are always a good idea for UARTs, gives the UART a couple cycles to sync up. Glad it's working for you now, though I am curious as to what exactly was going on, perhaps it was just a sync issue.

Sceadwian said:

gives the UART a couple cycles to sync up.

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Would you please elaborate a little?

perhaps it was just a sync issue.

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Seems you are right.