[Q] GT-N700 Note, signal problem

Hi folks, I have an unlocked note GT-N700, it works on other networks such as giffgaff/O2. But when I use a t-mobile sim it has a very weak signal then drops to emergency calls (useless). Tried 2 different t-mobile sims, both the same. Can sit my galaxy s3 beside the note and the s3 has good signal but the not remains on emergency calls.

I have tried an Orange rom, root the different roms, tried flashing different modems XXLR1 & XXLS0 still no joy.

Any help is appreciated. Just seems the note refuses T-Mobile (UK btw)