Sorry for the late reply, I have missed your post… Currently, I can’t reach your site for some reason.
Since you stated that the problems have started recently, It’s most likely you have a conflict with some of the plugins you have activated, so I suggest you check the plugins first.
Deactivate ALL plugins temporarily to see if this resolves the problem.
If this works, re-activate them individually (one-by-one) to find the problematic plugin(s).
Try to remember what you just did before the problems appeared.
Have you installed / activated a new plugin?