Arduino Nano + BME280 3.3V - NaN readings after a while

I have a BME280 connected to a Nano. It work well, but after 1-2 days it starts to read only NaN values (temp., hum., press.). If I reset the Arduino it gets better, but only for another 1-2 days. If I just only disconnect the sensor from the 3.3V and reconnect it, it does not help.

I gues I can solve it by putting a reset at the end of loop(), my code allows it, as there is only a "read-send-sleep cycle", but I want to know what could be problem.

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