Computer, usb or SD?
If its the latter, change to new usb memories and sd cards. i give it a 7 on the error scale that its the devices that give you these problems.
ALSO!, make sure you do not crossmix with unplayable different formats. I got the nexus to act up when i got several formats mixed with Flac or APE.
Make it simple and neat!
This year ive maybe chewed through at least 5 or 6 usb memories and maybe 3-4 sd cards.
They run hot and mess up the internals.
Ive made it a habit to buy several devices at once. And i keep to 16/32gb at max for SD, USB. And 250 / 1Tb for Harddrives and SSDs. You rarely need more then 32gbs for usb memories. Especially if you dj at club. And if you are a wedding / party dj you bring out the big guns and rock a hardrive / SSD
/M