How can I test if my SSD is faulty.

I purchased a SSD and acronis 2013 a year ago and cloned my hd to ssd and through it to the pc.
I noticed recently my speeds weren't great, to cut a long story short I was still reading and writing and booting of the HD.

I've done some research and followed the guides but I think I may have stuffed my SSD

I can backup and clone my hd but when I open acronis bootable drive and try to clone I receive all these write errors while trying to back up from external drive (which has backup) to SSD.

When I use the tools I also receive the same errors.

The BIOS detects the SSD and I have unplugged old hd etc.

Any suggestions please?

TIA