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Wrong data sent via MQTT

I am using MQTT since 3 months to transfer data (mostly soc and odometer) from my eUP to my own MQTT server to do pv optimized charging.

This worked always done, but since a coouple of weeks I receive faulty values over MQTT. There is now obvious reason or I cannot tell, when or why it happens, but it sometimes happens after some time working perfectly.

The real word thing is, that I can see, that sometimes Soc is reduced by 20-30% immediately, but on the web dashboard the values are presented currently.

Has anybody similar findings, or are there ideas why this happens or what I can do to overcast l fix that?