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Spike traps built in certain locations after loading a save game will lose health until they are destroyed. Tried restarting the game, problem still occurs. Spike traps built there before the save (I logged off right after a horde) were fine, but rebuilding them just causes them to slowly die.

I am experiencing the same problem. If a trap is destroyed and I place a new trap on that same location it will slowly take damage until it is destroyed again. This is not a constant but does occur about 85-90% of the time. The type of trap does not matter I have placed Stakes Traps back down and also tried Wire Fence Traps either way they decay until destruction.