Erratic, Unstable, Jerky Trackpad Cursor
On my MacBook Pro late 2011 running OSX High Sierra.
I booted into safe mode but the problem was still there, even on the login screen. However when I then booted normally the problem appeared to have gone.
After a few minutes though the cursor again seems a bit erratic although less than before, it's just not possible to be accurate enough for comfort, it seems to have a mind of its own when hovering over certain screen objects. Any help would be much appreciated.
ALERT 1
Having been rebooted for around fifteen minutes now the problem has returned with a vengeance, the cursor is almost unusable. I don't currently have an external mouse to test bypassing the trackpad
ALERT 2
It's now over twelve hours since ALERT 1, on booting up a few minutes ago the cursor is functioning with perfect sensitivity with just Safari open. At the height of the problem yesterday I was running Scrivener and Guitar Pro 7.5 as well as Safari. I have 16Gb of RAM and my MacBook is a flying machine, despite it's age. In addition to Safari and Mail I just opened Scrivener and Guitar Pro to try to replicate the problem but the cursor remains perfectly sensitive.
Apologies for the length of this post but if/when I find the answer I will mark it as solved so it can act as a reference in the future.
K