Welcome. 
Updating to the newest version should not be causing issues like this, so we are here to assist. We will need a bit more information more to do so,
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When you say it crashes, LightBurn should not crash. Please describe the steps you were taking when this happened. As best you can, the step-by-steps taken just prior to the crash. We also would like to look at the report generated when the crash happened. This will provide more technical detail for us to review.
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What do you mean by “After continued delays, the update has only made it slower…”?
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“…not recognize my camera anymore”. What are you seeing or not seeing around camera usage? Do you see the camera as available in LightBurn?
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How are you connected to the laser? USB or Network / LightBurn Bridge?
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What version of OS and was this recently updated as well?
We find the following informative, as to the things helpful to share when asking for help.