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I had this same issue. I was using something like this below to set an different colored image for the Marker.
var pinImage = new google.maps.MarkerImage(โhttp://www.googlemapsmarkers.com/v1/โข/โ + โd3d3d3โ + โ/โ);
This was reliant on googlemapsmarkers.com and is no longer working. As soon as I do not use this site to help with the MarkerImage then all is fine
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Looks like this has been deprecated
https://developers.google.com/chart/image/docs/gallery/dynamic_icons
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Please note that this issue has been recognized in the Issue Tracker via Issue #128905669, there is also an alternative solution offered by one of the support from Google which is to use https://www.image-charts.com/
Source:stackexchange.com