My computer has just stopped reading cds and the tray opens erratically by itself don't know what's wrong n e ideas

Firstly, do you have anti-virus installed? This might be caused by a virus or didn't you do any un-installations lately?

No I don't have and e anti virus programs installed and I have uninstalled some stuff I didn't need on there like old games?

https://www.askmehelpdesk.com/computers-beginners/cannot-get-cd-play-134713.html
Maybe you can use this, see if any of the info works for you.

Since you don't have anti-virus installed, it might be that you got a virus on your computer, To troubleshoot download AVG (free.grisoft.com/doc/28415/lng/us/tpl/v5), install and run a full scan...

Ohh, It free!

Look its some setting for the disc drive. It happened to my old computer. Unluckily, it can't be fixed. You can go to my computer and click on c: , d: or e: