Macbook Pro 15" volume level changes by itself

Hi all!
About a month ago I have upgraded my rock-solid Macbook Pro 15" (mid 2012) from Mountain Lion to Mavericks. All seemed fine (with the exception of some known annoyances with WIFI) until last week when all of a sudden the volume level started to change by itself. It started going up and down, turning mute and turning on again and so on, just like an invisible hand or a remote access have taken control of my machine (it wouldn't even let me change the the volume using the volume buttons while this weirdness is happening). This has never happened before. To make things worse, I have then upgraded to Yosemite and all seemed fine but then the weird volume changes appeared again and I now am stuck with no straight forward way of reverting all the way back to the original Lion (which worked perfectly since Mac purchase back in 2012).
Can anyone help?
I have googled for similar issues and have seen  some answers (mostly not that relevant) including a thread on this forum suggesting to reset the SMC. I have tried that using the suggested key-combination press, but it did not seam to have solved the problem, as the volime changes continue when I least expect it.
Is this a hardware problem? If so, would a change of the keyboard resolve things?   [ At some stage I thought maybe the problem was caused by the fact the I have fiddled a little bit with the keyboard by lifting the :; key (next to L and under P) and applying a bit of WD40 to clean a tiny spil of sugary liqid that caused the key to get sticky.  But the volume keys are way far on top of keybord so my assumtion was/is that the volume changes would not be related to the cleaning. ]
is this a software problem? Some thread on similar (not identical) issues had suggested there are some bugs in soft and Apple is aware. For this reason I gave Yosemite a go but the problem continues. Would reverting to Lion sole the problem you think?  [ Maybe I should ask here if anyone can suggest how to go about this downgrade as Option-Cmd-R key-combination press at start up does not give me the Interner Recovery scree anymore, but keeps taking me (just like Cmd-R) straight to the OSX Utilities where can wipe of the disk (which I did) and reinstall Yosemite only. ]
I would very much apreciate any replies that might help me solve this issue.
Many thanks
Ty

HI Ty ..
Might be something you have no tried yet here >  Troubleshooting issues with no audio from built-in speakers on Macs

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