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It would help if you could tell us what version of Lightroom you are using, what operating system you are using, how much RAM is installed on your computer. The more details you can provide the more likely it will be that someone can provide assistance.
I'm having the same issue. about every five minutes lightroom closes and asks me if I'd like to back up the catalog. NOTE: it's not "crashing", it's closing as if I had decide to quit, which I haven't. I"m a professional working under deadline and I can't have a tool that's randomly quitting on me. It's ridiculous that we can't call a support technician to sort this out.
Here are the specs for my system:
Lightroom version: CC 2015.10.1 [ 1117303 ]
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.12 
Application architecture: x64
Logical processor count: 8
Processor speed: 2.5 GHz
Built-in memory: 16,384.0 MB
Real memory available to Lightroom: 16,384.0 MB
Real memory used by Lightroom: 732.0 MB (4.4%)
Virtual memory used by Lightroom: 1,674.4 MB
Memory cache size: 120.3MB / 3,864.7MB (3.1%)
Maximum thread count used by Camera Raw: 8
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 92MB / 8191MB (1%)
Displays: 1) 2560x1440
Graphics Processor Info:
AMD Radeon R9 M370X OpenGL Engine
Check OpenGL support: Passed
Vendor: ATI Technologies Inc.
Version: 4.1 ATI-1.51.8
Renderer: AMD Radeon R9 M370X OpenGL Engine
PS -- this error has only started since I updated Lightroom to the current version last week. !