I have two phones on latest production preview, L640 and L820.
L640 failed to install Skype Business, Skype will be put to sleep later this year and upgrade adviser failed to update on WP8.1, so I hard reset it, installed upgrade advisor, upgraded to TH2 .107, went to insider and updated to 393.67 followed by another hard reset and setup without restore. It fails to update gestures, Sygic navigation and Scan - QR code do not install. It's maybe 5th tome
L820 installs Sygic fine but fails to update Excel, it downloads 0.7MB and calls it a day (on L640 Excel was 10-11 MB!).
Both were updated to 393.82 but it does not make things better.
Weather was fine on both.
I don't know what is going on with store or phones or W10M or whatever (random variation on errors, no wonder MS is not pushing W10M as direct OTA to all compatible devices), but it looks like L640 will face recovery tool again and stay on WP8.1 for good...