I took the bolt completely apart and wiped it down. There was a fair amount of carbon and/or factory lube in there. Haven’t had a chance to shoot it again today though. Just curious what shimming the springs would entail? Adding an additional washer between the springs? I think if the problem persists I’ll just replace the springs though rather than shim it. I store my rifles bolt open, but wonder if storing it that way with the spring compressed could have weakened it- if it wasn’t a high quality factory spring used.