Temperature sensors' values disappear

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Hello Max
What means disappear - the readings are -60 degree?
IF it happen, it means that controller is not able to decode read frames from sensors.
It can be caused by wrong connections but more probably are poor sensors, or long cables.
I newest firmware 1.57a we change little this function, to try more  times (more frames) decode and if not success show -60 after longer time.
Maybe it help, but for reliable measurement system I suggest check sensors first. IF they not work correctly alone it is bad  sign.
Did you buy this sensors from tinycontrol?

Hello Notek,
the value are not -60 degrees, but rather null. The situation lasts for 5 till 16 seconds approx. and then the temperature value come back again. In UI it looks like this:


As I wrote earlier, this started to happen 2-3weeks ago, before that there was no problem at all. The sensors are original LANKON-070.

I have bought another LK3.8, I'm going to try to change the device for a new one. I can flash it with new 1.57a firmware, if you recommend that.

Any other ideas?

Thank you!
Best regards
MaX