By default, ProTop on Windows attempts to restart itself once per minute. Follow these instructions to change it.
The default restart for the Windows ProTop3 DB Monitor service is 1 minute. This allows ProTop to quickly restart itself after a server reboot or at the end of a maintenance window. In ProTop 327 and later, this also sends restart attempt info alerts to the portal, which some folks find too nagging.
The file bin\nssm_setup.bat sets this value during installation:
nssm64 set "ProTop3 DB Monitor" AppRestartDelay 60000
Add a zero to that 60000 value, and the cycle time will become 10 minutes between messages. You can set that value to your preferred cycle time (in milliseconds).
To do this, run %PROTOP%\bin\nssm_edit.bat, select the "Exit actions" tab at the top right, and change 60000 in the bottom right corner to 600000. Click the "Edit service" button at the bottom right to apply the change: