Hpa Issues

[Calmtber2018]

Hey guys, I'm fairly new to this forum so bare with me.
I was wondering if someone could help me with regards to HPA setups
ill keep it short I promise.

So basically I have recently upgraded my WE 416 to HPA when I first obtained the gun it was shooting
fine until the hammer had worn and I had a massive dip in power, which I replaced the hammer and then worked fine for a couple of months.
until again I have the same issue. Surely the Hammer couldn't ware that quickly could it? And also I received this new hammer without a bearing roller
and still worked fine. So I'm not sure if maybe its an issue with the hammer or HPA in winter? I would really appreciate any help or advice cast my way.

Note: Sometimes when cocked the gun can recoil like its suppose to. And also my Glock 19 shoots fine when tapped into the line.