Sometimes the page will be very stuck when switching, it will take a long time to jump or just can't jump over, sometimes there is no problem, what is the reason for this very fast?

I would like to ask you a question, ah, the page is sometimes very stuck when switching, it takes a long time to jump or just can"t jump over, sometimes there is no problem, what is the reason for this very fast?
is there a boss who knows well? can you help me? Thank you in advance!

Sep.25,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3d0ab-2badc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3d0ab-2badc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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