Hi Elena,
I'm Roshan V S, Independent advisor and a Windows user like you.
I appreciate you for providing details about the issue and we are happy to help you.
Did you changed your hotspot password recently? If you did then forget that network on your PC wifi settings
1 Press Windows Key + I shortcut to quickly open the Settings app.
2 When Settings app opens, navigate to Network & Internet section
3 From the menu on the left select Wi-Fi. Now click on Manage known networks.
4 List of memorized Wi-Fi networks will appear. Select your Wi-Fi network and click the Forget button.
5 Then connect to your hotspot network again.
If that doesn't help try uninstalling your wireless software driver windows will re- install this one next reboot.
If the problem is caused by phone, then Reset network settings by tapping Settings > General > Reset > Reset Network Settings.
Do get back to us with the result. We will be glad to help if you need further assistance.
Best Regards
Roshan V S
Indepedent Advisor