Unfortunately problems like these can be caused by any number of things (theme code, a plugin, or even data).
I’ve always had good luck narrowing down issues using the Debug Bar plugin. (You can then disable this plugin once you’re finished testing).
I’ve never used the P3 Profiler plugin, but it seems to have good reviews and may also be helpful.
I think once you narrow down the real cause, you’ll then be able to tackle the real issue (and post back here with more information if you need more specific help). Best luck!
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