Unstable USB after downgrading to Mojave

[glenster]

I am having issues with my Macbook pro 2.3 GHz Intel Core i7, 2012 model, with 16 GB 1600 MHz DDR3, NVIDIA GeForce GT 650M, running OS Mojave 10.14.6 and USB 2.0

A few days ago I downgraded from Catalina to Mojave due to hardware issues (could not run Catalina without crashing, lagging and graphics card issues) , and I am now experiencing temporary freezing on connected external USB drives. When accessing the drives it can take up to a minute to display the contents, and when viewing videos stored on the drives they randomly freeze for 30 sec to a minute before continuing playback. When saving large files I regularly experience disk freezing and disks ejecting mid transfer. Disks then remount themselves after a few minutes. These are not issues I experienced with Catalina or any previous OS, it began specifically after the downgrade.

 

[Cory Cooper]

Hello and welcome.

Can you explain the downgrade procedure you used? It may be helpful in troubleshooting.

You could try the following resets to see if that clears it up:
-How to reset the SMC of your Mac
-Reset NVRAM or PRAM on your Mac

Let us know if those help,

C

 

[glenster]

Hi, I followed the procedure outlined here: https://www.digitaltrends.com/computing/how-to-downgrade-from-catalina-to-mojave/

 

[glenster]

I have tried restarting in safe mode, and no issues were reported. Also turned off the firmware password settings, ad run disk utility without finding any errors. These other resets I have not tried.

 

[Cory Cooper]

OK, thanks.

Those steps look good.

Try the SMC reset especially, as it controls things like power and the ports on your Mac.

Let us know how it goes,

C

 

[glenster]

Hi, have reset SMC and NVRAM, so far it seems stable, have managed to copy some large files across USB, and I have turned off powersave in case it has something to do with trying to put discs to sleep.