Could you comment on Taganrog, Russia?

It is really hard to say if the readings are bad or not without confirmation from the station owner. It states that the tube used in cronyx's station is a J305. These are a glass tube and are susceptible to interference from light. This can be sun light or electric light bulbs. What looks to be happening over the past few days is an electron avalanche happening from within the tube, possibly caused by light interference. But, it also states the counter is indoors, which often rules out direct sunlight, although not always. It could also be electrical interference causing incorrect readings.

It is hard to say without information from cronyx if the readings are bad or not. You could send cronyx a private message and hope the user sees it and responds: https://radmon.org/index.php/forum/profile/1246-cronyx