When a dodgy disk enters the drive it leaves a residue and it will cripple the drive. Happens quite lot to me as I am forever using old disks. What I use immediately is a disk head cleaning kit until the disk starts to run properly again. Also try tapping the disk on the desk a few times and even very gently beding them. Also helps having a high density drive and swapping between. The disk head cleaner generally gets them working. When you here a swish you should never leave a disk in the drive.
https://www.scuzzscink.com/amiga/scuzzblog_december20_1/car_sbd_021220_21.jpgPS Takes a lot for me to lose a disk.
