vanG,
i’ve no experience with NSN, but such problems are quite generic – i dont think it is specific to NSN !
i gave you pointers to isolate the PGSM / G1 problem. First of all, look for all parameters that have an influence on EGSM radio resource management. In ALU, there is such a parameter, so I’m sure there is one as well in NSN (something like “RR ALLOCATION EGSM”)
good luck…
pix