Frequent timeouts when viewing my product page - Error 524 reported by CloudFlare

Hello,

I am getting random, but frequent timeouts when viewing my product pages. Eg https://www.shapeways.com/model/2843532/nvidia-shield-tablet -and-controller.html?li=shop-results&materialId=25

I don't know how to reproduce this timeout issue, but it happens frequently the past days. Attaching a screenshot.

I just got this error on all other pages. So, its not just my product pages.

File Upload also can not be done due to the same error during this weekend.

JC