Solution for this topic
Thank you so very much for your response. I rebooted WordPress and the website seems to be working fine apart from it being very slow to update my logos. Last time I rebooted I also activated the “coming soon” plugin and I think this is where there was a clash. This time I did not activate it at all and it seems ok. I’ll keep an eye and let you know if there are any other problems.
Thank you very much!