MBP 2011 13" Calculator behaving erratically + graphics issues

Hi all,
My setup is early 2011 MacBook Pro 13" (8,1) Intel Core i5 2.3Ghz, Intel HD Graphics 3000, aftermarket SSD/HD hybrid drive + 8GB RAM.
I use the latest full size Apple Wired keyboard with my MacBook and when using the Calculator app, whenever I press either 4, 5, or 6 on the keyboard number pad, it causes whatever operation has already been typed in to clear. Other numbers are fine. Note that this does not happen when using the number buttons above the letters on the keyboard, or when using the mouse to click on the numbers.
I've also been having intermittent problems with the display on the MacBook showing strange horizontal lines and other graphic distortions and needing to be force-restarted to resolve, whilst other times the display won't turn back on from sleep despite having enough charge. I know there has been a lot of talk about logic board and graphics card problems of 2011 MacBook Pros and wonder if anyone else is having these same issues. I don't believe 36 months is a fair lifespan for a $1500+ machine.
Could the calculator issue be a sign that the laptop is failing? If anyone has a similar experience (or fix) I'd love to hear.
Thanks in advance

After some further testing I can add to the above keyboard number pad issue:
1. Problem exists in both Mavericks and my Yosemite beta installation (both on the same HD, different partitions)
2. Problem also exists in any Mac OS X app text input fields, including Safari and Preview (i.e. if I type a word followed by the number 4, 5, or 6, the text input field will clear)
3. Problem does NOT exist in text editing apps such as Pages, Notepad, etc.
3. OS X makes the default error sound continuously when the keyboard is initially plugged in, but after unplug and replug the error sound stops.

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MBP 2011 13" Calculator behaving erratically + graphics issues

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