Macbook Air keeps disconnecting from the Wifi

Every 15 minutes or so lately my Macbook air (2020 version) disconnects from my home Wifi. When I look in the Wifi bar it says it is not connected to any wifi, and then when I click on my wifi network it connects fine again straight away. This is frustrating as my home wifi connection is very fast and I sit near the modem. I am due to sit online exams next week and I do not want it to be cutting in and out during the exam.

Any suggestions would be greatly appreciated thank you!