WiFi connection

If the iPad disconnects when idle (sleep/locked) you may need to verify the your WiFi Settings for each of your configured WiFi Networks - ensuring that they are set to Auto Join:

Settings > WiFi > [WiFi Network / SSID] - tap the “i” icon - set Auto-Join to ON

Unless Auto-Join is enabled, your iPad will not automatically reconnect to the WiFi network when resuming from sleep - or when coming into range of your WiFi network.

Auto-Join is enabled/disabled for each configured WiFi network.

What year and model iPad do you have/own?

What iOS/iPadOS version is this iPad, currently, running?

What is the rated, internal data storage model of your iPad and how much of this internal data storage capacity is left inside of your iPad model?