How to set to reboot PC automatically upon detecting Wi-Fi dropped?

You could schedule a task to do that based on an appropriate event id.

This discussion mentions some event ids - you can check to see which one might be useful by inspecting your own log.
wireless networking - How to check the event log (if any) for network failure? - Super User

However, I have to ask- why would you wish to do this? It seems incredibly drastic, and could result in lost work.

I agree with dalchina.

Perhaps merely disabling then re-enabling the WiFi adapter would achieve what you want.

Try it manually the next time WiFi is dropped.

Control panel,
[View by - Small icons, just so you can see everything],
Network & sharing centre,
Change adapter settings,
Right-click on the WiFi adapter & select Disable,
Right-click on the WiFi adapter & select Enable

If that does whatever it is that you want done then you do not need to take the drastic step of restarting the computer.

You can use a batch file, that needs to be run as Admin, to replace the manual steps above:
DisableEnableWiFiCard.bat

Code:

:: The WiFi must be turned on first
prompt $g
Set /a Found=0
set FindString=Name
Set UseExpresssion=netsh wlan show interfaces 
for /F "tokens=*" %%X IN ('%UseExpresssion%  ^|   find /i "%FindString%"') do Call :Interfaces "%%X"
GoTo EndGetWiFi
:Interfaces
Set ThisLine=%~1
Set AdapterName=%ThisLine:*: =%
GoTo :EOF
:EndGetWiFi
:: Do the disabling-enabling
netsh interface set interface "%AdapterName%" disabled
netsh interface set interface "%AdapterName%" enabled
::Pause to check outcome

I needed to do this with my last computer but no longer need to do so. I never managed to put together a reliable method detecting when the batch file was needed so just ran it when I could not connect. I hope the link dalchina gave you helps you get further than I did.

Best of luck,
Denis

I have studied the link dalchina gave you. About the helpful post starting "The eventlog filter would be" by SilverbackNet dated 14th August 2020:-

1 That thread is about detecting loss of the internet connection which is not quite the same as your question here.

2 The poster meant to write Task scheduler rather than Task manager. If you define an Event viewer, Custom view then you can use it to trigger a Task scheduler task.

3 I have attached a Custom view definition for detecting loss of an internet connection. InternetConnectionLost.zip You can import it by clicking on the link on the right-hand side of Event viewer Import Custom view … Importing this Custom view will do no harm even if you decide it is not quite what you were after.

4 If that Custom view was what you were after [but I don't think so from what you've written] then you would then be able to select it on the left-hand side of Event viewer, Custom views and click on [on the right-hand side] Attach task to this Custom view... and it would step you through defining a TS task. I would suggest testing the results first by just making a simple task such as running Notepad [C:\Windows\System32\notepad.exe] and only bothering to refine the task to do what you want when you have decided that the Event viewer, Custom view is detecting when you want it to. Please note again that that SuperUser thread is not addressing quite the same question as the one you have asked here.

Denis

Are you certain that you want to shutdown & restart whenever the computer fails to detect another computer that is on that specific IP address?
If so then your commands will achieve what you want.

I remain concerned that my advice might be inappropriate because I remain concerned that I do not understand why you want to take this drastic action.

Denis

You'd also have to run that as a repeated test.

You would be wiser to look at ways to reconnect your Wifi, or, far better, find out why it's dropping. For example, is the signal weak? Consider extenders and placement - proximity.

Consider using a different Wifi band- perhaps there's a conflict- interference.

This freeware program shows you the bands and signals near you - the one in use will hopefully be the strongest.


This is more helpful:


- and allow you to monitor the signal strength over time graphically:


Are you certain the connection is dropping because fo Wifi problems- or because of your ISP connection being erratic?

Do other devices experience the same thing?