Compressor already slowing down

Purchased one of Amazon's $250 shoebox compressors and have been happy with it.

When I first purchased, it would start at 19⁰ and finish at 26⁰ and take 1min 32 seconds average to fill from 100-200bar.

Last night I aired up my rifle and heard it squeaking a bit, noticed it slowed down significantly at about 160bar and didn't get to 200bar for another 1min 44 seconds.

Overall end temp of compressor is finishing at 43⁰

×××EDIT××× This was fill number 23 for transparency

BIG DIFFERENCE!

I'll pull the shroud off of it and see what she needs. I do have 2 rebuild kits for it that came with it, so we'll see.

I'll add pics of rebuild and show you what I've found. May help someone else.
 
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When you call it your "Amazon Shoebox" compressor what brand are you writing about? Some brands need only have the check valves cleaned and others need a full takedown and cleaning. Good to read you have rebuild kits on hand. It might be a good idea to order a few more of the rebuild kits. Remember, silicone lubricant used sparingly is your friend.