"Unknown Error" all the time, every time on render of project, any codec

Question

Trying to render a feature length documentary for a film festival (ie.. I don't have time for this). The project timeline runs 1 hour and 20 minutes. If I try and export or queue the timeline in media encoder to h.264, QuickTime or Select "Match Sequence Settings" as my output format, the media encoder fails to render with the very informative "UNKNOW ERROR" every time at random point in the render procedure. When rendering it as an mpeg once, I am able to see one place where it crashed. It is a place in the timeline where the are no transition, not cuts, no overlays, absolutely nothing out of the ordinary. Yet, it crashed there this time. Next time, it will crash elsewhere.
I am trying to render the timeline on segment at a time. So far, each smaller segment of 20 minute blocks seems to be rending just fine and goes past the points where other renders failed. Looks like Media Encoder can't handle large projects.
Here's all the requested information for a complete diagnosis of the problem.
Error given to me by Media Encoder : "Unknown Error" --that's it. The time rendered varies between 43 minutes and 3 hours.
- Encoding Time: 00:54:04
05/03/2015 05:59:03 PM : Encoding Failed
Export Error
Error compiling movie.
Unknown error.
Adobe Premiere Pro CC 8.1 Caravan
2014.2 Release
8.2.0 (65) Build
OS X 10.10.3 (14D136)
iMac (27-inch, Mid 2011)
3.4 GHz Intel Core i7
24 GB 1333 MHz DDR3
AMD Radeon HD 6970M 2048 MB
I'm right handed, my favorite color is blue, the computer is on the Eastern TimeZone
I need this timeline rendered and I'm not interested becoming a forensic-level technical authority on Premiere to get it. This problem has come and gone now for months and is intolerable. I pay for software and I expect it to work, and at least give me something more useful than "UNKNOW ERROR." There is no such thing. As a former developer, I can say with authority that simply dumping to a message that says this is lazy and sloppy programming. Buffer underruns, stack overflows..whatever. Everything is caused by something. I can't begin to diagnose this problem unless Adobe provides software error handing that gives me some idea of what happens. Where did it happen in the timeline? What routine/subroutine gave the error? Was it a codec error? Come on....these things are not unknowable.
Adobe, PLEASE stop coming out with new features when you can't make your existing pay by the month software reliable! Maybe FCPX is worth another look.

Answer 1

UPDATE:
tried rending the entire project as Quicktime ProRes 422 (since that is what clips were recorded in originally anyway) and Media Encoder gto 89% complete....and the entire application CRASHED. WHO-HOO! Way to go, Adobe!!!!!
Here's part of the crash report if it means anything. Maybe I'll try it again and see if anything changes! Can't get any worse.
Process:               Adobe Media Encoder CC 2014 [864]
Path:                  /Applications/Adobe Media Encoder CC 2014/Adobe Media Encoder CC 2014.app/Contents/MacOS/Adobe Media Encoder CC 2014
Identifier:            com.adobe.dynamiclinkmanager.application
Version:               8.2.0.54 (8.2.0)
Code Type:             X86-64 (Native)
Parent Process:        dynamiclinkmanager [826]
Responsible:           dynamiclinkmanager [826]
User ID:               502
Date/Time:             2015-05-03 20:05:05.829 -0400
OS Version:            Mac OS X 10.10.3 (14D136)
Report Version:        11
Anonymous UUID:        5CCC287C-7B70-E4F9-D0E8-4180FB0681CC
Sleep/Wake UUID:       0ED73954-6C5A-4CCE-B807-974B71171E95
Time Awake Since Boot: 33000 seconds
Crashed Thread:        0  Dispatch queue: com.apple.main-thread
Exception Type:        EXC_CRASH (SIGBUS)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib         0x00007fff94c8d4de mach_msg_trap + 10
1   libsystem_kernel.dylib         0x00007fff94c8c64f mach_msg + 55
2   com.apple.CoreFoundation       0x00007fff94955eb4 __CFRunLoopServiceMachPort + 212
3   com.apple.CoreFoundation       0x00007fff9495537b __CFRunLoopRun + 1371
4   com.apple.CoreFoundation       0x00007fff94954bd8 CFRunLoopRunSpecific + 296
5   com.apple.HIToolbox           0x00007fff8ab7256f RunCurrentEventLoopInMode + 235
6   com.apple.HIToolbox           0x00007fff8ab722ea ReceiveNextEventCommon + 431
7   com.apple.HIToolbox           0x00007fff8ab7212b _BlockUntilNextEventMatchingListInModeWithFilter + 71
8   com.apple.AppKit               0x00007fff8c8fe9bb _DPSNextEvent + 978
9   com.apple.AppKit               0x00007fff8c8fdf68 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 346
10  com.apple.AppKit               0x00007fff8c8f3bf3 -[NSApplication run] + 594
11  com.adobe.exo.framework       0x00000001057f3a88 exo::app::OS_AppBase::RunEventLoop() + 56
12  com.adobe.ame.application     0x00000001000195c1 AME::RunTheApp(exo::app::AppInitArgs&, std::vector<std::basic_string<unsigned short, std::char_traits<unsigned short>, dvacore::utility::SmallBlockAllocator::STLAllocator<unsigned short> >, std::allocator<std::basic_string<unsigned short, std::char_traits<unsigned short>, dvacore::utility::SmallBlockAllocator::STLAllocator<unsigned short> > > >&) + 11809
13  com.adobe.ame.application     0x0000000100049ba8 main + 440
14  com.adobe.ame.application     0x0000000100003e34 start + 52