每日吃瓜

So I have this tree for a year and 2 months now, and in the last 2 weeks or so leaves started falling, they get dark green, then yellow and burn a bit at the tip, then they fall.
Don't really know what the problem is, I repotted it 2 days ago and it's still getting worse. Roots were fine, soil was clean.

I need any kind of help or advice.
Thank you.

some kind of root problem. Most likely.. Salt accumulation in the soil.
When you say "repotted", what do you mean?

First of all thanks for the fast reply

By repotting, I mean I took it out of the pot, cleaned the roots of dirt, cut the tips of a few, then placed back in the pot with new soil.

sorry to but-in, but i think it could be the stress, as i can see new, open buds in the picture. also it is a chinese elm of somesort and they can sometimes lose there leaves for no reason. i could be wrong.