Midi plays back or records in erratic pitch (note) after a few seconds

It started using Logic 9 about a year plus ago. I would record a midi piece and it would play fine for a few measures and the transpose to a different key and play on that thereafter or maybe random for that matter. The piece would not be recognizable. I would stop the playback and and restart again and would play fine for a short while and then start playing on a completely different note (pitch?). Then I updated to Logic X and the same behavior happens. It also occurs when I am recording. For example I am playing a C and all of the sudden it will become a D or G, even though I am pressing the same key. Running Yosemite 10.10.2 and Logic 10.1.0. 17 inch powerbook from around 2011, 8MB ram and lots of space. Persist thru system software updates.
The problem has persisted thru the updates.
It occurs in all my projects. Sometimes it will occur soon and sometimes after a while.
Any thoughts would be welcome.
Have tried unchecking the pitch boxes in the preference panels. May be I am missing some.

The most common causes for such an issue are;
A pitchbend wheel that is not correctly resetting itself to zero or moving around 'by itself' resulting in random pitch evens being sent to the Mac...
Check the Event List for pitchbend events...
or...
An iOS device such as the iPad that has been used as a midi controller and the app is still running in the background.... (Quit not close the app and test)
or
Some other kind of external controller issue...
Use a Midi Monitor such as the free Snoize
http://www.snoize.com/MIDIMonitor/
to monitor all midi events and see what it's log shows...

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