Thank you, Florin_Anghel, for the list of issues you found.
I would also like to add one - it is a big problem particularly if you use the phone for work.
First of all, I have a Lumia 650 with Windows 10586.164 and the new firmware 01078.00037.16082.41014. Even before the firmware update, I had permanent losses of the WiFi connection, usually 3 times per day, and no matter which WiFi network I use. I get my job mails on my phone, so I need a stable and reliable WiFi connection.
After the firmware update, the loss of the WiFi connection is still there. My router writes a protocol of the WiFi connections where I can see exactly when the connection gets lost. I made an Excel spreadsheet and calculated the time spans between two WiFi losses. ALL of them happend exactly after full hours or full ten minutes of operation. Examples: The WiFi connection got lost after exactly 10:00:00 hours, 14:00:00 hours, 5:00:00 hours, 2:30:00 hours, and so on. This cannot be coincidence anymore as I recorded a lot of these events already.
I had my WiFi settings checked with the router manufacturer, and they are completely okay. The problem also occurs when I use another WiFi network. In both networks there are a few other devices using the same WiFi settings, and they are perfectly okay. There is not much traffic in the WiFi networks I use, and there are only a few other networks around (and comparably far away and weak), so no problems from this side.
I also have a Lumia 640 with the same Windows 10 version, and it never loses the WiFi connection in the same WiFi networks.
Do you folks have any information if Microsoft is working on the problem? I really like Windows 10 Mobile, but as I need reliability for work, I have to think about leaving W10 if there is no solution in the very near future. Sorry!