I having this pixhawk RTK gnss but no gps fix

My pixhawk gnss last few days been giving me this “No GPS Fix” error.
I kind suspect the issue is with the connector as it been stain with some paint.
But on the antenna itself usually it comes with this blue light that will lit up when there is a fix, but nowadays there isn’t any.
Anyone knows if connector/wire issue can results in No GPS fix? Connector issue can prevent antenna from fixing?

USB 3.x devices or cables emit EMI that prevents GPS fix
Do you have any of those? disconnect them to test it.

No, not that. I tried other gps it works. Only this