Rendering speed is slowing down during process, almost up to freeze

Hello there!
First of all, I'm a new person to After Effects. I bet I just doing something wrong, but anyway I would like to ask an advice how to fix my issue because googling such subject won't solve it.
The point is following:
I rendering 120-minutes long video for YouTube. It almost static with no effects, just with a few simple fade-in/out transitions on couple of layers. You can find an example of such video on YouTube by this link: Daniel Lesden - Rave Podcast 056: guest mix NitroDrop (Israel) - YouTube (for some reason, specifically this video was rendered successfully previously).
Process is going very well at first, 1 minute of playback rendering for about 30 seconds, so first hour of the video rendering for 30 minutes.
The problem starts at about 70% of overall progress: it start to slowing down, and then goes to 1 frame rendering for 1 second. As you can imagine, it's a pain for such long videos, it will take a days to finish last 20-30%.
Composition and render settings are following:
Size: 1280 x 720 px
FPS: 30
Format: Quicktime
Codec: ProRes 422. I've also tried: Animation, Photo JPEG, another ProRes and even H.264, but outcome was the same.
Output module settings screenshot:
Multi-processing settings:
On this point I have to say that I've tried many different options with amount of CPU, RAM or with Multi-processing option turned off completely, but in the end it all was the same.
After Effects version: CC 2014 (still on trial version, but it shouldn't be a problem since Adobe don't have any limitations for trial versions as far as I know).
Computer and OS information:
Any advices please? I'll very appreciate every possible solutions.

"open AE preferences>General then move to the bottom tab and set AE to purge every 10 frames or so"
— I've set this parameter to 10 as suggested, and here are the last render queue results:
First 60-minutes video rendered superb good for 1 hour 17 minutes.
Second 120-minutes video goes really badly: it took 8 hours to render about quarter due to error. Here is what I found in the error log: "There is an error in background rendering so switching to foreground rendering after 246 frames completed out of total 216000 frames. (26 :: 142)".
Later I've tried to render second video again, and it was great almost till finish: 1 hour 45 minutes has been rendered for less than an hour. But then it suddenly slowed down (as described in the original post), so I had to stop it. I installed Memory Dig and "optimized" memory before rendering and once during process, but it didn't help. In the end I just rendered last 15 minutes of the video (with no issues) and just merged it into 120-minutes long file using Video Joiner. Pretty sad method, although.
On a third attempt everything was fine until rendering stops by a new error in popup window: "After Effects error: internal verification failure, sorry! {could not find itemframe we just now checked in}".
So the original problem still wasn't solved yet unfortunately.

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