[Galaxy Note 4 Android Development (Snapdragon)] GerardSamija:
Sorry that I was unclear; yes, as I've reported quite a few times in this thread, some of my data drops include a complete darkening of the connectivity icon, going to just a dark grey triangle with black inside. Most are just the x in the lower corner. Some are also just a white triangle with no '3G' to be seen. If I've been less than forthcoming with data drop related verbiage, it's because of the mixed messages all along for the past two months. I was hounded by other users for mentioning data drops in early September, so I stopped posting here at all as a courtesy. Then ripee invited input on data drops... then not so much... then again... it's all a bit confusing. I understand that this problem is a 'known issue' for some variants, mine included (though I'm still confused there, as ripee calls my phone a 910T but Phone Info and Kernel Adiutor tell me it's a 900W8), and that no authoritative fix is yet announced. Last I heard officially it seems the problem itself hasn't been identified.

As for snoopstitch, I'm further confused. I followed your link, downloaded F-Droid, installed from the APK and launched, which promptly took me to the Play Store on the CY Security Antivirus Cleaner page, asking me to install that. So I guessed that this was part of what you're suggesting and installed that. Opening this new install took me to a window with 'Fdro...' in the upper left corner and some other tabs, showing me a message "All apps up to date. Congratulations! All of your apps are up to date (or your repositories are out of date)." Which makes my head spin a bit. Is F-Droid malware, doing something weird? I'm seeing no 'scan' option anywhere. There are tabs called Available, Installed (4), Updates (0), a search icon, a refresh icon, Swap Apps, then two menu icons. I've been about a second away from opening RevoUninstaller since installing this useless baggage... but have held off that impulse pending further input from you, as I really have no way of knowing what the heck this nonsense has to do with my connectivity issues.

As for things appearing in the log, I have submitted multiple logs earlier in the thread, both logcats and dmesg files. So far pretty much zero in the way of feedback on those, from ripee or _mone or anyone else, though they've been requested.

Also, as I've stated multiple times in this thread (and in a PM responding to a PM from ripee this morning) while there are known dead or weak zones for my provider in my city, my house has never been one of those. I work at home, getting out for maybe an hour a day most days, sometimes not at all. With my Note 3 the connection was always rock solid, first with a bigger cellular provider, then with the smaller Freedom Mobile (formerly Wind) which I have used for the past couple of years. 4 bars, period, day and night. Some of my clients also use Freedom Mobile and likewise never have a problem with connectivity on working phones. It's only with the Note 4 acquired in August, and only after jumping from 6.0.1 to 7.1.2, that I've been experiencing problems, and only in Lineage builds. No problem with RR or a couple of other ROMs I've tried - but there were sufficient other problems in various others such that I've come back to hoping Lineage would work out for data, as everything else usually works fine here.

Edit: I've run a scan with the CY Security app. It's claiming a 'Fraudulent SMS Vulnerability' and offering to repair it. Tapped 'Repair Now' and it says "Perfect" and "You phone is in peak condition!" Spelling error aside, that sounds like a good thing... tapping 'Finish' it says "Perfect Protected for 1 day" which isn't reassuring. I'm thinking that app is getting uninstalled. Last thing I want is another background service hogging resources. The Note 4's inherent laggy nature even under Lineage isn't ideal at the best of times. More services generally mean more lag.