I have a wonderful shohin Japanese White Pine on its own roots. It is struggling, yellowing and needle drop all over. It is spending the Michigan winter in my sunroom with 35+F temps. It is also on a heat pad averaging 65 degrees. I am assuming the issue is root related. I am struggling with the notion of repotting it to see if a repot would improve the situation or leave it go until it hopefully improves on its own. If I were to repot I can keep the tree from freezing and keep the roots nice and warm. The tree was potted from pre-bonsai 2 years ago in 1-1-1 with 1/16 left in. I am guessing the shin and roots are suffering with native soil. Repot now or wait, any opinions? Thanks
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Is the soil allowed to dry between watering? Found this info on pines in general. I have lost several Ponderosa pines to fungus.
Hope for the best, but keep this tree away from any others to prevent cross contamination if it is suffering from fungal disease. 
Thanks for your response. Will check it out
I would wait and watch.
So, did the tree NOT get winter dormancy temps the last two yeers? ( Time below 30F.) Or, was the tree out in the 90+ F summer sun for root fry?
Either could be the problem.
Post a photo and closeup.