I was browsing and noticed the following code in your last reply:
READ: JNB RI,$
CLR RI
MOV A,SBUF
RET

This will not work well, especially if receiving multiple data.

You should clear RI after retriving the first data byte...
READ: JNB RI,$
MOV A,SBUF
CLR RI
RET

I found this out the hard way once!!
Best Regards