How to clear/refresh UDP InputBuffer?

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I've written a matlab script that receives data over udp and successfully graphs it realtime...however I'm having some trouble with the script crashing over what I assume is a problem with the inputBuffer becoming too full. (Not sure if this is the correct assumption)

Here's why I think that... Program crashed after a few seconds when the InputBufferSize = 1000... When I increased the the buffer to InputBufferSize = 1000000 (Just any Huge Number) the program runs for about a two minutes before crashing. I'm wondering if there is a method to clear the inputBuffer of a udp object in matlab and if this would fix the problem. Anyone know? Thanks :)