BAF-908 CB3S Tuya stopped connecting after SSID dot, nightly WiFi disconnects

Welcome.

I have a question for you regarding the device configuration on Tuya. The question relates to the watering 'machine' - BAF-908 on the CB3S module. The device today after 1pm stopped being seen by Tuya. Several attempts to add to Tuya/Smart Life - always an error. Router reset, update - no effect. As a test, I created a WiFi network from a smartphone and gave it the same name as the previous network with which the BAF-908 worked - still no possibility to add it to Tuya . I started combining and yes - the parent network was 'Tykris 2.4' (working on 2.4GHz). It turned out that all I had to do was replace the dot (.) with a comma (,) and suddenly ONLY after this change the device can be added to Tuya. My question - why such a change? The device had been working on the network "with a dot" for over 2 years and suddenly stopped.

Second topic : BAF-908 - every night from ~23 is invisible in the WiFi network. Looking for the manual, I came across an extended version with a description of the hidden WiFi menu. Below I paste the table with the description of the hidden WiFi menu:

.

Can I ask you for help in understanding/setting the whole thing so that WiFi access is 24/7? What I wouldn't change (setting WiFi off time and on time to 00:00) I have no idea how to validate the changes. Do I "do not move anything" after the changes and the device exits the hidden menu automatically, or do I hold the various combinations, I always have a return to the original settings.

Thank you for your help

@skaktus
The Tuya programme/app itself saves and stores files.

You need to find the app on your phone and delete all saved files and the cache.

Then log into the app again and add the device.
Of course we do this on the phone, the WiFi network on the phone should only support 2.4 GHz.
Once you've gone through the whole process, as long as your main router is on a 5 GHz network, you can switch to that network and there will be communication - but only after the devices have been added to the app, correctly recognised and can be managed.

>>21583400 .

I did as you write - no effect. I changed the phone to a new one that never had Tuya on it and also failed to add the device - add error and no more. I did a test with Smart Life - still the same.