Pointing phone camera at ThingMark

I have issues using the ThingMark: When pointing the camera at the ThingMark the app starts to load the data but somehow this takes a very long time and leads to no result in the end. The experience won't appear. When I first tried it out it worked (even though it took about 3 minutes to load) , however it doesn't work at all now (the amount of data to load up is 10 MB). The WIFI - connection was perfectly fine during the loading-process.

Does anyone have any suggestions to solve the problem? Thank you.