If only the Mode was different probably that won't help either, but test it anyway. The other thing you could do is to lower the transmission power of both 2.4GHz and 5Ghz bands to Middle and test...

@Clades Describe your network setup / topology (ISP devices, your devices, how they are connected) Observe your device LEDs during these disconnections : How do they behave during the issue ?

@Shanky2201 Try these wireless settings:

No, that was just a suggestion, a lot of people still leave TKIP as an encryption protocol. Mentioning that, what are your settings there ? By 'connection dissapear' what do you mean - connection to...

@Stovenkore Have you downloaded and installed the latest drivers for your OS from here ?

@Clades Turn them all off (including Smart Connect) and then switch them on one by one - observe which one may causing the issue. Make sure your wilreless security looks like that: If wired clients...