Reset your Network adapters, see if that helps.
Settings, System, Reset Options, Reset WiFi Mobile Bluetooth.
Also try the following. If the option is available to you.
Disable "Sleep Standby Optimisation " in the
Settings, Battery, Battery Optimisation, 3 dots menu top right, Sleep standby optimisation.
Re-start your device.
Also. Go to Settings, WiFi & Internet, WiFi, WiFi Preferences and disable Intelligently Select the best WiFi.
Also check out additional possible solutions at the link below.
How To Fix Common Wi-Fi Problems In Android
https://www.techjunkie.com/fix-wi-fi-problem-android/Click to expand...