I am using BLE print to connect and print with a zebra printer (zpl)

my work flow is as followsStep 1. Scan printer,Step 2. Connect to the selected printer,
Step 3. discoverServices
Step 4. discoverCharacteristics,
Step 5.  peripheral writeValue for Characteristic discovered
Step 6 wait to complete and disconnectAnd this seems work fine, but in some devices after lots of successful prints just randomly loses connection, (ie the printer is not connecting to the iOS )

is there any solution for this ?