Temps were high teens to low 20's, w/ wind, but dry. No snow or rain. The bolt seemed to move slow, not crisp. Several times on follow up shots I had to drive the bolt forward by hand. I had no issues with the gun in September at all. It fired and cycled perfectly.
What reasons have you found for an 11-87 to act this way, especially in the cold.
I'll add that I do not remember cleaning the shotgun after my September hunt. It was for sure clean prior to that, and I ran about a box of shells through it (3 cranes, 2 mallards, and some misses).
If I add lube, I use Tri-Flow and have for years. I use it sparingly.
The gun had very little to no silt or sand in it when I tore it down for a thorough cleaning.
I have owned the gun since new (21+/- years) and have not replaced any parts.