@SDU 

You did a lot, but:

1) Did you try to run Windows network troubleshooter and if yes, have you checked its "View detailed information" section to see perhaps something there can hint at cause of an issue;

2) Have you tried connecting PC to Deco by Ethernet cable? 

3) Login to Deco mesh Web interface, under Advanced/System/Time Settings see what current time it reports and if it the same, including time zone, as on your PC.

Also, how many Deco M5 you have, do they run in Router or AP mode, does you PC try connecting to Satellite or Main Deco, and if Satellite - does that Satellite show other WiFi devices successfully connected to it?

@SDU 

>My main deco is in the living room i cant use the cable.

This is just for troubleshooting purposes. If it happens again, bring Satellite Deco to where PC is and connect them both by Ethernet cable. The purpose of this test is to find if it is WiFi related issue or not. If PC can't get an IP address and can't connect to Internet even over Ethernet cable, it's not.

  @SDU 

in case this helps anyone, I had a similar issue. Several devices were all of a sudden unable to connect. (1 laptop, 1 PC, and a SIP device for an IP Phone). 
 

I tried all sorts of troubleshooting steps (config changes on PC Ethernet adapter, reboot all network devices (modem, TP Link devices and network switches I have on my network). Nothing worked 

FINALLY. This worked.  
 

I tried switching from wireless router mode to access point. And then back to wireless router mode. 

(On the Deco app go to More > Advanced > Operation Mode)
 

this did the trick. After the final switch back to router mode all of the disconnected devices were able to obtain IP addresses 

hope this helps anyone who might have a similar issue.