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The node I have been using is anyx.io. It has been reliable for me. You can change servers by going into settings. Let me know if that doesn't fix it for you, or go into help in eSteem's Discord.

I am also configured on anyx.io
Maybe there are too many photos and it started to slow down?

That shouldn't be a problem. If you are sure you have the latest version, keep changing servers until you find one that works for you. Try doing a test post or two.

I used to publish one or two posts a day through eSteem. And yesterday I uploaded a lot of photos and ... started making them clickable. Here is a weak editor. While editing, he began to slow down, and refused to publish at all. Maybe you should pay attention to the developers?

Please go to the Discord and report this. They do appreciate learning of any bugs people are finding. @horpey