Ok, Jlujan. I will acknowledge by your own statement that you truly do not disagree but merely didn't see it this way.
A: I stated that possibly it was due to excessive heat, causing a gas to form of the resin during curing thus leaving small bubbles.
B: You stated, that you cure by sunlight during the summer and "almost" always see the bubbles. But... in the winter months you use your lamp and see no bubbles..
Lets see.. summer, sunlight, temps w/high heat, bubbles..
Winter, sunlight or uv lamp, temps below 50degrees, no bubbles..
Hmmmm.. I do believe you hit it right on the head.. Thank you for sharing..

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