You have done enough, more than enough actually,    Reinstalling windows and replacing wifi card was the breaking point. I am not sure why Dell support is asking to update the Driver.  12.0.0.1118  is the latest driver.  Only other thing you can try is to use another WIFI network as it can be compatibility issue with your router. QCA9377 doesn't have a very good reputation. I would suggest to ask Dell support for a replacement card of another model. (intel). INTEL 9462, is something they can ship you.         
Hi All, I am writing here to ask you for help with Dell Inspiron 3593 Windows 10 home 64 bit with Qualcomm QCA9377 802.11ac Wireless Adapter. Since July 2021 I am having issue with disconnecting randomly from a WiFi but recently it is really annoying. It is just randomly disconnects from WiFi and it cannot detect any WiFi (as actually there are around 30 wifis). The only solution to recover the connection is to restart the computer or to use cable. This problem can be found only on this device. Other 2 laptops and phones are not having such issue. I alredy tried: Unfortunately, it does not help.  One funny thing that I noticed is that actually device manager is saying that current drivers are for qualcom are 12.0.0.1118 but actually Dell Support is still saying that i am missing this driver. I installed this driver with Windows Update and reinstalled Dell Support. What else could I do in order to debug this issue?
Dell Inspiron 3593 - not detecting any wifi