Mac renaming automatically issue

Bonjour,
since the yosemite update my Mac Book Pro has a few issues:
1- The mac name is changing automatically, even when I force the name again in the setup after a while the computer is automatically renamed. A number is added at the end of the name (X) and changing almost twice a day
2- as a result the backup on the time capsule backup is impossible: backup destination is full.
     I deleted all previous backups, and my time capsule is empty (1.8 TB available)
3- When the name is changing, the files deleted with the old computer name are not cleared by the system, and my disk is almost full.
     Currently I deleted 100 GB of files, but still cannot see the space available, and there is nothing any more in the garbage.
Any suggestion?
Best regards.
Bernard

I cleaned out my mac with compressed air, it was dusty, but the display flickering happened again.
So I followed your advice and installed:
Temperature Monitor
http://www.bresink.de/osx/TemperatureMonitor.html
Which showed that my memory module 1B and 2B were 70 - 75'C(160 -167'F). There was no reading for the graphic card so I couldn't tell if that was over heating.
Then I installed:
smc fan controller
http://www.macupdate.com/app/mac/23049/smcfancontrol
and increased the memory_cpu fan speed which lowered the temperature of the ram to 60'C (143'F).
I even changed this ram's placement and put it in different slots.This ram was the same temperature in the new placements.
Also this is the kingston 2gb ram without heatsinks. Ive used it for 1.5 yrs, and this is the first time its giving me these problems.
Do you know how I can check if the graphic card is over heating? or is the problem just with the ram?
Thank you for all your help!

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