There are many causes as to why your WiFi keeps disconnecting - signal strength, wireless interference, network overload, outdated WiFi drivers on your PC and/or your router or problems with your internet service provider.
You can try disconnecting your device from the WiFi, rebooting your router and reconnecting to see if that resolves the issue.
Check for driver updates on your device by using the Dell SupportAssist application if installed on your device or by opening a browser to https://www.dell.com/support/home/en-uk (Product Support) and downloading the drivers. NB: Do not download and install the BIOS update as this has to be done by a member of the IT Team
Turn off power saving setting of your network adapter:
Right click on the WiFi icon on the task bar and open Network and Internet settings
Select Change adapter options
Right click on your WiFi connection and select Properties (you may need to enter your Domino email and password for admin/elevated privileges)
Click on the Configure option
Open the Power Management tab and ensure the box is unchecked as below
Adjust the scan valid interval
Then select the Advanced tab and scroll down to locate the Scan Valid Interval option - change this to 120 as indicated below.
Click OK to apply the changes in both cases.