What happens with my router on Openwrt?

Router is TP-Link TL-WR842N/ND v2 on openwrt 14.07
Everything worked like a charm but recently started to happen strange things.
Sitting at the tablet as he suddenly disconnects from wifi and cannot connect to the router. Says no Internet or something that can not obtain ip by dhcp.
The laptop is on Ubuntu connects fine to wifi, but the Internet is slow.
And as I noticed, it stops only on wifi. PC connected via lan wire is working as usual, speed takayazhe (measured speedtest).
In the log of the openwrt kernel no errors. In system log also no errors. Load 0.01 0.03 0.05 on average. The active compounds
195 / 16384 (1%)
All this continues until a reboot of the router. After the tablet reconnected and Internet on wifi again, fast. And how to explain it.
Again the router is the minimum load/not filled nearly RAM/no errors in the kernel log and system log. But the Internet connection to become slow and not stable. All this continues until a reboot of the router.
2 answers
July 9th 19 at 11:03
Solution
change the wifi channel number, your channel someone sits and interferes with the operation of your equipment.
If so then why after a reboot everything returns to normal? On idea all should work bad, even after a reboot - Aurelia56 commented on July 9th 19 at 11:06
Well, there they also have some kind of synchronization between devices. Roughly when one is not broadcasting, the broadcasting is another. Just on your channel can sit 2-3 and 10 devices . and they bluntly interrupt each other. - Damion.Upt commented on July 9th 19 at 11:09
: you are right. Scanned. Revealed that 14 and 1 channel are the best. But how to check whether my tablet to take the 14 channel? - Aurelia56 commented on July 9th 19 at 11:12
Obviously to start work on the 14th channel. The tablet itself will find. - Damion.Upt commented on July 9th 19 at 11:15
unfortunately in the settings of the router was not 14. Only 1-11. Chose the most appropriate - 1 until normal flight - Aurelia56 commented on July 9th 19 at 11:18
Then you can mark the answer as solution :) - Damion.Upt commented on July 9th 19 at 11:21
: put. I hope the router will no longer fail. If not then buy a router with 14 channel - Aurelia56 commented on July 9th 19 at 11:24
: That is not necessary to buy. Usually, the standard settings of the firmware is the "Select country". If you play with the country selection, some options will be available on channel 14. For Example, Japan. This is due to local legislation. On OpenWRT as it works - don't know, but Tplink hardware support it. The only question is whether your device this range to support :) - Margarette.Casper commented on July 9th 19 at 11:27
July 9th 19 at 11:05
Yeshe can the power supply be damaged

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