You have a critical error whilst using the variable 'count'. Since you have declared the variable as in 'int' you must be careful when sharing a variable between an interrupt and your main code as an int is two bytes - the processor is only 8 bit so it has to do two reads to get the variable. An interrupt may happen between these two reads and corrupt the value read. Do the following in your main code:

EA = 0;
copy_of_count = count;
EA = 1;

use copy_of_count.

Whilst the above may not be the problem you are observing, it will cause other problems - random problems at that.