Yes, a new firmware is available: 2.1.1. This is a bugfix issue with a record number of fixes! We managed to solve a lot of the issues mentioned on the Facebook group and on this forum. Some are hard to reproduce, however and may come in 2.1.2. In any case it should make the GR-1 a lot more usable!
https://www.tastychips.nl/gr-1-downloads/