Translation:
My iPad systematically loses wi-Fi connectivity. At first, this did not happen and the iPad connected to the network on its own. But recently, each new session of work must begin with the settings, connect to Wi-Fi. How to solve this problem?
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.