Help Apps for reading logs/troubleshooting OS & App Issues

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I've been having some weird random type issues on my DINC over the past week or so and I'd like to track them down (buzzing from phone, screen goes blank and won't come back on, freezes). I've got lots of apps installed and am wondering if the source of my problem may be related to one of those apps (this seems highly likely unless I have a hardware issue).

Can anyone recommend any good apps for capturing error events or examining application or system logs on an android device?

Thanks