Does not always import products

I like the plugin so far but since yesterday I'm starting to have some problems. On my regular Ubuntu laptop when I open more than 4 Ali tabs in Chrome the page hangs and has to reload just to hang and reload again. On a Chromebook I don't have this problem.
The other thing is most of the time editing a product and then publishing it works great but sometimes I edit products,publish and then there is nothing added to the store. I have this problem on both Ubuntu and Chromebook. I like to debug it but don't know where to start with a Chrome extension.
Does nobody else have this problem?? How can I debug this and find out what's going wrong? It costs me a lot of time constantly checking every product import and redoing it multiple times if it fails..