hi,
I think it is not error after label XRAM: but inside sorting logic instead.
So have some questions:
1) what do you copy bytes into 0x40...0x4F locations for?
2) your sorting algorithm comes to dead loop if there are two bytes with same value; look at your code more carefully:

CLR C 
SUBB A,@R0 
JNC MOVE

So, if two bytes are the same then it means they will be exchanged. As result, R5 will be increased and so after 15 iterrations your code will go to LOOP1 again. Then it will find these two bytes again and exchange them yet another time and ...look above - it is dead loop. To avoid such situation you should do something like:

CLR C 
SUBB A,@R0
JC COUNT
JZ COUNT 
MOVE:

In fact, next time I will try to look at your code more complex due have no time yet :(

Regards,
Oleg