I have the same 5 in 1 that you do. If your 5 in 1 is in the sun its picking up radiant heat from the sun. I built a 6in thick insulated structure to inclose my temp sensor and have no more temp spikes like yours. Which means my temp sensor is located remotely from the 5 in 1 unit. If your interested in moving your sensor PM me and I'll be glad to share what I did.
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