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juergs:
May be also an interference by switching relais?
Certainly there is no or rather minimalistic surge supression on the relay-card?

https://www.omron-ap.co.in/service_support/FAQ/FAQ02804/index.asp

Adding some Capacitance (100nF, 1..10 µF)  in the 3V3 or 5V line will probably help a lot ;-)

Some ideas: https://www.infineon.com/dgdl/Infineon-AN372-AN-v01_01-EN.pdf?fileId=5546d461464245d3014695667b266a49



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