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Update from my side. I disconnected the mixer comfort valve for Grundfos hot water pump and the noise went away, connected it back and it started happening again with that specific sink. For the toilet, I installed an arrestor, and it made the noise less obvious. I think I'm just going to...

Please post an update here with your findings. I have a very similar problem. Thumping sound after turning off the sink or when the toilets stop filling. We recently had a plumbing reroute due to a slab leak and the plumber assures me that all pipes are secured properly, otherwise they wouldn't...