Could you do two experiments for me. I think the cookie policy stopped this from happening for me. Go to the cookie policy at the bottom of the page.

Go to "Performance Cookies" and "Targeting Cookies", and turn them off.

As an aside, I initially implemented this change a while ago because the performance of the Meraki Dashboard is significantly faster with those cookies turned off. According to the Chrome developer performance tools - it cuts several seconds off the page load time on some pages. Seconds! I can feel the improvement in the snappiness of the pages.
Failing that, go into Chrome developer tools (CTRL+SHIFT+I), go into "Local Storage" and "Session Storage", locate any storage used for the meraki.com domain, right click on it, and go "Clear".

I originally found this technique when using Cisco Partner tools, and they would keep breaking. I found a post on Reddit that said Cisco's WAF blocks requests with session storage over 256 bytes. Once you use enough of the tools, the storage slowly grows till it crosses this threshold. And BAM, your requests get blocked and you get random errors. Every single time I do this "Clear", the tool starts working again.