selfmade Cul Stick crashed sometimes

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Hello, I have a problem with my self-made CulStick. After he worked some days without problems, it has fallen out apparently without reason. Beside the power LED the second LED flashed like mad. I have restarted pimatic. Without success. I have tried a Reset in the Nano. Without success. The CulStick did not want to work again. In the end, helped only one new start of the Raspberry.

I suppose he has fallen out after he has sent concurrent to 5 thermostats. Maybe 1%Regel is the reason. Could this be? This send to these 5 thermostats functioned some days before without problems.

Does somebody know the reason for this failure of the CulStick?
Can I make a rule for a supervision of the CulStick?
Can I restart the CulStick about pimatic, without new start of the Raspberry?

I hope, I have expressed myself understandably.

I have made a GIF of the flashing Arduino Nano. Maybe my problem is such a thing clearer.
The Cul is not accessible any more if he flashes so.

Hello again, is there nobody to me with this problem can help?
Now about one week ran the CulStick without problem. Yesterday, nevertheless, again this fall. And today immediately once again. I can find no cause for it.
I think, in the meantime, that it does not lie in 1% of regimentation. For it there was no occasion.

tried another nano?

If I do not have yet. I will try it on the week-end.

Also my suggestion, had similar problems with an homeduino and a very cheap nano clone.

Many thanks for the answers.
I have another two Arduino Nano lie about. Both of the cheap kind. With the cheap Nano as a Homeduino I never had problems.
Unfortunately, I know still whether I on the week-end time for it has. (The temperatures rise, there is work in the garden)
In any case, I still have (I hope higher-quality) Nano ordered. Maybe I will wait to him here is. Since the last failure runs of the Cul again without problems.

I contact, in any case, whether another Nano has helped or not.

Hello, now I have changed the cheap Arduino Nano to a Nano with FT232R chip. I hope that this problem is repaired now. The time will show it.
So or so. I will report it here once more.

Now the real Nano runs for over one week without problems.
It looks as if the problem really in the Clone Nano.
Thanks for help.

Really nice to hear!! If you face any problems again pls. tell us. But hope it will be stable now