Purchased the Sony Tablet in June 2012, started to shut down during regular use (blank screen, swirl

I am a long time Sony customer… mostly TVs and other entertainment items.
Purchased the Sony Tablet in June 2012, started to shut down during regular use (blank screen, swirly lights comes on, and soft reset required) in September 2012.
December 2012, issue started to take place more frequent (to the point it was too annoying).
Sent the tablet in for repair before X-Mas and just got it back from the TX repair center yesterday (1/14/13).
They replaced the motherboard.
1/15/13, 11:49AM, the same issue happened.
I am asked to mail it in again, so they can fix the issue.
I like Sony products, but this is something new for me.
I like to know if this is common for the tablet, please share story.
My concerns are:
They replaced the motherboard (that is pretty much the core of the tablet!)
What do I do when my warranty expires in June 2013 and the issue is still there?

I and many others have the same issue. You can an find some links to reported issues in my thread.
Sony has yet to acknowledge the issue and define whether it is software or hardware based. This lack of communication is very disheartening.

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