First, Welcome!
That is a healthy-looking, husky plant. I think that it could be moved up to a slightly larger pot. Also, that will give you a chance to look at the roots, which will help you determine wheter there is a problem or if that leaf drop is just force of nature (losing old leaves does just happen) , I would suggest small or medium bark, or possibly an inorganic medium such as LECA. At any rate, it shouldn't ever dry out completely. This type doesn't really want a dry winter rest. This can be a really rewarding plant - long lasting, brilliantly-colored flowers, and producing new batches of them. Once it gets going, it can stay in bloom for many months.
It should be grown quite a bit brighter than your Phals - at your northerly latitude, I don't think you need much shading at all unless it feels hot in that window space in summer. In winter, you'll may even need supplemental light for it.
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