SXT AC freaking out

So I have 1 RB SXT G-5HPacD connected to a RB260GSP (I have swopped 260GSP’s btw)

When I start to do a btest through the sxt, the SXT loses power and the 260GSP reports crazy low output values

eg

49mA
0.86W

compared to normal sxt on same switch

168mA
2.848W

then I power the power on and off a few times, it comes back. So now, I have replaced RB260GSPs, I have replaced cables, what else can I do? Its running 6.27 with latest firmware (3.22).

When I do a btest from the SXT itself I am able to send lots of traffic but when I try recieve it goes dead. SWOS does not report too low voltage or anything, power output just drops super low