Dell Inspiron 7558 Wifi Problem Intel Dual Band Wireless AC 7265

I recently purchase the 7558 Inspiron 2 in 1, I installed fresh Windows 10, and install the updated driver. I am having same issue on my 7558 with Intel Wireless-AC 7265. Computer starts fine, has internet for a few minutes and then I get yellow triangle. Please tell me what should i do. I installed the new 18.40.9 driver also but problem remain same. i also put this question to intel forum and follow their advise but problem remain same i am using th windowns 10 x64