We have have a mixed environment with MR33, MR42, MR46, MR53, and MR56 (just installed 150 of these over the summer). All buildings are running 29.5.1. Last night I updated our one Middle School which have (58) MR56 AP's to 29.7. Haven't gotten support involved yet. Some really strange issues that I've noticed with the MR56 and 29.5.1 which caused me to do the upgrade:
We have a specific Samsung Chromebook touchscreen with Intel Wireless 7265 chipset rev 59. Our librarian uses it and said the wifi signal is poor (only thing that changed over summer was the model AP). We went from MR42 to MR56. I was able to see the signal on Chromebook constantly go from excellent to good to weak every few seconds... Took a newer HP Chromebook that students use and the signal was constantly excellent. There is a 10-15 db signal difference between the HP and the Samsung Chromebook. I have the exact same Samsung Chromebook in my bag and also had same issue. Tried various versions of ChromeOS too. No problems with Mac laptops on same desk. I also don't have the issue with the Samsung Chromebook when I go to my office in the High School (MR53 AP's).
Another issue I'm seeing is constant roaming of clients (specifically iPhones). We don't have band steering or client balancing enabled. All buildings are configured the same. I was in the building last week and saw my iPhone roaming every few seconds to different AP's. Chromebooks, Windows devices, and Mac devices seem stable. I'm getting reports of poor wifi calling behavior (dropped calls) all using iPhones. I checked some client logs from the teachers with the problem and they are all exhibiting the same weird constant roaming like I had. I'm not seeing the constant roaming when I'm at my office in High School connected to MR53.
Going back to the middle school on Thursday morning to do more testing.
