Error message on specific pages "A problem repeatedly occurred"

Hi,

I'm hoping to get some urgent help with a site I've just published: https://www.magnasystem.com/

I keep getting an error message on two pages - sometimes the pages load, but mostly they start to load and then the error message pops up with:

"A problem repeatedly occurred on [page address]".

This is only an issue when viewed on mobile (on an iPhone viewing via Safari) - no issue when viewed in Desktop.

The two pages are:

1. https://www.magnasystem.com/magnatiles
2. https://www.magnasystem.com/magnacladding

Page 2 was a duplicate of page 1 prior to editing, so I'm not sure if there's a piece of code/other formatting issue causing this? All other pages have no loading issues.

Thank you!

I am getting the same error in Chrome and Safari when I try to load a page with embedded Spotify playlists. It used to work but not lately. What do I do?