OK my findings were only found in Chrome and Slack. Slack is a Chromium App. and so I think this issue is with the Slack and Chrome developers. not with Apple. Possibly this could be a fault in Electron framework, but Facebook Messenger did not have an issue.

This is not fixed in 12.1+ I am on 12.3.1 and there is clearly an intermittent stop in scroll using a mouse, but track pad is fine. In Chrome and Slack, I can demonstrate with Logitech and Razer mice behaviour. In Chrome on this website: https://pmd.github.io/latest/pmd_userdocs_extending_writing_java_rules.html#rule-execution I tested on 2 Macbook Pros (14 & 16) both have the issue both on 12.3.1 It does not happen every time but with persistence it will and I can nearly with 100% certainty make it happen, within a 10second time period. I have also done a video recording and will be sharing it with Apple. Here are the 100% steps to make it happen but sometimes it happens for other reasons: Here are my steps to demonstrate the issue: On the above webpage or in Slack. Go to the scrollable panel and scroll until you cannot scroll any more, e.g. 2 or three scrolls down(natural). It might scroll but 2-3 times and it should settle and stay settled at the top of the panel. Go the the side panel on the same application scroll down 2-3 times (panel does not scroll so no visible affect). Go back to the Scrollable panel, again scroll down 2-3 times and it should not move(expected). But now scroll UP, and boom it does not scroll the text in the scrollable panel up (which it should) now you can scroll up and down constantly and nothing happens as if the panel is locked in place (focus is not on that panel). now either stop scrolling for a few seconds and it will work again, or move the mouse again and it will work. Now once the scroll starts to work again you can sit there for a few more seconds and it will stop working (sometimes), as if the mouse loses focus. THIS IS NOT ACCEPTABLE! This same procedure can be done in Slack.app too, and I expect many other applications. I have been getting more and more frustrated thinking my mouse battery was dying or the wireless or laser or something else. But Wireless Logitech and Wired Razer mice both do the same thing exactly, on multiple apps. So this narrows the problem down to Apple and the mouse drivers, or maybe it is screen focus. which is highly possible because our macs continually lose track of which is the MAIN SCREEN (the menu bar moves to external display. Again I have raised a ticket for this (problem has existed for 10years and Apple ignore it.)

This is not fixed in 12.1+ I am on 12.3.1 and there is clearly an intermittent stop in scroll using a mouse, but track pad is fine. In Chrome and Slack, I can demonstrate with Logitech and Razer mice behaviour. In Chrome on this website: https://pmd.github.io/latest/pmd_userdocs_extending_writing_java_rules.html#rule-execution I tested on 2 Macbook Pros (14 & 16) both have the issue both on 12.3.1 It does not happen every time but with persistence it will and I can nearly with 100% certainty make it happen, within a 10second time period. I have also done a video recording and will be sharing it with Apple. Here are the 100% steps to make it happen but sometimes it happens for other reasons: Here are my steps to demonstrate the issue: On the above webpage or in Slack. Go to the scrollable panel and scroll until you cannot scroll any more, e.g. 2 or three scrolls down(natural). It might scroll but 2-3 times and it should settle and stay settled at the top of the panel. Go the the side panel on the same application scroll down 2-3 times (panel does not scroll so no visible affect). Go back to the Scrollable panel, again scroll down 2-3 times and it should not move(expected). But now scroll UP, and boom it does not scroll the text in the scrollable panel up (which it should) now you can scroll up and down constantly and nothing happens as if the panel is locked in place (focus is not on that panel). now either stop scrolling for a few seconds and it will work again, or move the mouse again and it will work. Now once the scroll starts to work again you can sit there for a few more seconds and it will stop working (sometimes), as if the mouse loses focus. THIS IS NOT ACCEPTABLE! This same procedure can be done in Slack.app too, and I expect many other applications. I have been getting more and more frustrated thinking my mouse battery was dying or the wireless or laser or something else. But Wireless Logitech and Wired Razer mice both do the same thing exactly, on multiple apps. So this narrows the problem down to Apple and the mouse drivers, or maybe it is screen focus. which is highly possible because our macs continually lose track of which is the MAIN SCREEN (the menu bar moves to external display. Again I have raised a ticket for this (problem has existed for 10years and Apple ignore it.)