Eject problems - 128GB USB

Im using a Sandisk Extrem PRO 128GB USB stick to hold my music collection, synchronized with the "sync manager" in Rekordbox. Everything works fine, but when I try to eject the USB with the "USB stop" button, the light under starts blinking, and it takes at least a minute for this to finish till the light turns off and I can safely eject my stick. Is this always the case with big memories? My 64GB sticks doesnt have the same problem. 

Last time I was playing at a bar with CDJs 2000 nexus, and the light never stopped blinking, so I just dragged the stick directly.

The problem is that I never know if the stick is corrupted or not, and sometimes if it gets corrupted some players like the RX3 usually give lots of problems in the middle of a gig. So what I´ve been forced to do is to reformat my usb stick and sync the whole library again, which takes at least two hours, and sometimes I do it dont even knowing if the usb stick is corrupted or not.

Is there a way to know if usbs are corrupted or not? Is there a better way to handle 128GB usb sticks? Is this behaviour normal?