The mining scanner that comes with the prospecting missions autoscans the same asteroid over and over and over again filling the screen and making it hard to select other asteroids.....it would not be to much trouble to manually activate the scanner. Then once would be enough.

This likely should have been posted in Bugs, since what you describe is not normal behavior. Further, this behavior is not isolated to just one type or instance of a scanner, since all scanners behave the same way; scanners always scan your current target every 5 seconds.

Based on your description, however, I assume that you have the targetless plugin installed, since this is a known issue with that plugin when the Ore list is selected.

The devs don't support the client when plugins are installed and will ask you to remove all plugins and verify the problem is still happening. If you don't have any plugins installed, then this is definitely a bug.

Yeah, it only does this with TargetLess installed. Turn off the roids list if you're going to be doing the prospecting missions.

I don't have this issue, however I usually set scanner as secondary weapon or have auto fire turned off as well.

yes I do have the targetless plugin. I'll try some of the fixes suggested see if that helps.

I just switched it to scan for something other than ore in the targeting box and that fixed it . Thanks !!

Scanners are passive and always-on. What port they're equipped to or what trigger they're configured for is irrelevant, except for creating a light show.