Wireless network keeps disconnecting problem

I encounter a Wireless network keeps disconnecting problem (often, frequently disconnection). My laptop is a DELL Precision 5510 with Windows 10, and my router is an O2 router (O2 box 6431).

Problem: When I use DELL Precision 5510 with Wifi with O2 router (O2 box 6431). Restart the router only solve the problem temporary.
My solution: It seems 802.11n of DELL Precision 5510 has a problem with my router. I am not sure the problem is which side (notebook or router). But these two stop communicate after a while. The router can still connect to Mac book and Fairphone, but the DELL notebook cannot connect to the router.
Detailed steps

Comments

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Lx=d: SundayResearch

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