Windows 10: Bad wifi on computer suddenly

I have a router that has a speed of around 200 mbps. Everything seemed fine and the Wi-Fi on my computer was 200 mbps as usual and one day the Wi-Fi speed on my computer dropped down to around 30-40 mbps randomly. I restarted my computer to see if that would do anything and when my computer restarted, I went to test the Wi-Fi speed again and it was still around 30-40 mbps. I decided to unplug my router for 15 seconds and and plugged it back in and tested the Wi-Fi again and as usual, 30 mbps. I was getting frustrated about this and I just decided to leave it and thought it would fix itself. 1

:)

 

Win10 computer suddenly unable to access printer on home wifi

For some reason, the printer lasted less than 24 hours printing correctly, and now I again can't fix it, even by doing what "worked" before (Comment #6 upthread).

Regarding the static IP suggestion:

1. The printer is connected via USB to a Windows 7 computer on the home network. It's not on the network by IP address. Here is a screenshot of the printer port properties.
   
   
2. Although there ARE "headaches" as is said above, the vast majority of the other computers on the home wifi network, NEVER have had a problem printing to it. And this applies to computers that have run XP, Win7, Win10, and MacOS. For the most part until now, it's included the particular Win10 computer in question.
3. If I still might be able to give it a static IP address, will this affect the other computers that have been able to print to it fine using printer name?

 

2 laptops suddenly cannot log onto wifi.

Have 2 Win-10 laptops that were doing fine - Nighthawk R700P set up many months ago. Suddenly both cannot log onto wifi. Going to list of available networks, choosing "home" and disconnecting and then reconnect does not help. Suggestions? Not the greatest computer wizards here.

Lenovo laptop wanted latest Windows update; upon rebooting everything seems fine. Other machine is actually an HP all-o\in-one, not actual laptop - but Win10 anyway. Will check if update is needed.

Now HP is OK as well. Problem began there yesterday and on Lenovo today but now both seem OK. Curiouser & curiouser as Alice said; sorry to have taken up your time.

 

My computer suddenly cannot find my WiFi

My computer has previously been connecting to the internet but now suddenly cannot find the WiFi. I am sitting right beside the modem and it is working correctly (my phone and my partner's computer connect correctly). When I use the trouble shooter it
asks me to select a network and several neighbourhood connections are shown but my home WiFi is not on the list. I am not a computer expert and do not feel comfortable to reinstall or disable aspects of the system.