AVR-Chat

--- In AVR-Chat@yahoogroups.com, Moataz Hussein <husseinmoataz@...> 
wrote:
> ... 
> If it starts giving correct output it continues this
> way, also if it starts giving strange output it
> continues.

This sounds a lot like some uninitialized variables or such..
Are you using interrupts? Do you save SREG in ISRs?

> My question is:
> 1- Why is it sometimes working ok and stable and
> sometimes not? if it is getting correct output code
> why sometimes it is corrupted?

The error is in line 78 of your source code.

>>>> Oh, you didn't show it to us??

Then it might be somewhere else... ;-))