ERROR pieces:trash emptying trash failed

You should not touch the trash folder. You doesn’t have files older than 7 days. After 7 days files got removed automatically.

Regarding ERROR collector unable to delete piece

Error getting current used space - related either to slow disk or corrupted databases. To check databases you can use this guide: https://support.storj.io/hc/en-us/articles/360029309111-How-to-fix-a-database-disk-image-is-malformed-
Error from the current thread has this solution: