DaVinci Resolve closes unexpectedly during its work

I need some technical help. I'm not able to work as DaVinci Resolve on my computer tends to shut down unexpectedly in random moments. Usually it happens while adding some video clip to timeline. Always happens while rendering/exporting film.
I'm afraid I can't provide any more details. There is no error message I could post here. Program closes without leaving any information.
Are there any ways to check what happens?

Problem occurs on DaVinci Resolve 15.2.4.006.
My PC has 12GB of RAM, Windows Task Manager shows usage of memory at below 50% at the time of crashing, so its not bacause of low memory.

Which GPU do you have? What's the format and codec of the video you try to work with?

Which GPU do you have? What's the format and codec of the video you try to work with?

GPU: AMD Radeon HD 6800 Series
Working with mp4 video. This is what MediaInfo shows me:

Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (mp41/isom)
File size : 14.1 MiB
Duration : 19 s 840 ms
Overall bit rate : 5 968 kb/s
Encoded date : UTC 2019-02-12 11:45:23
Tagged date : UTC 2019-02-12 11:45:23

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L4
Format settings : 2 Ref Frames
Format settings, CABAC : No
Format settings, RefFrames : 2 frames
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 19 s 820 ms
Source duration : 19 s 820 ms
Bit rate : 5 890 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (29970/1000) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.095
Stream size : 13.9 MiB (99%)
Source stream size : 13.9 MiB (99%)
Encoded date : UTC 2019-02-12 11:45:23
Tagged date : UTC 2019-02-12 11:45:23
mdhd_Duration : 19820
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 19 s 840 ms
Bit rate mode : Constant
Bit rate : 79.9 kb/s
Nominal bit rate : 128 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 193 KiB (1%)
Encoded date : UTC 2019-02-12 11:45:23
Tagged date : UTC 2019-02-12 11:45:23
mdhd_Duration : 19840

Your GPU might be too weak for Resolve. But you could try and transcode your H.264 footage into DNxHD.

> But you could try and transcode your H.264 footage into DNxHD.

Can it be done in Davinci Resolve? There is an option when I right-click on video in Media Pool: "Generate optimized media".

Also, is there any way to see why exactly is it crashing? Does Davinci Resolve save some logs somewhere?