Ssh often can not connect?

for the same server, ssh is often connected well in the morning, but not in the afternoon.
maybe if you connect well today, you won"t be able to connect the next day.
there is no connection or prompt, it is stuck here and there, and the ctrl-c does not respond and must be turned off.
but the putty is stable, and the connection is normal at all times.
I use the depth deepin 15.6, this is not the system Bug ah.
I have a headache.

Ssh operation-and-maintenance
Apr.28,2021

you can ssh-v user@passwd to see the debug information

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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-64f5-1b330d7-40ea5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b330d7-40ea5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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