Most likely as stated probably adding too many chips at once. When I got my MasterBuilt electric I ruined 2 smokes this way. It doesn't take very much.
At the risk of sounding like a girlMailbox mod
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Can use one of these or a tray in mailbox. Works great for smoking cheese also.
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The lighted box is the Auber PID controller. It keeps temperatures within 1-5° of set temp, unlike the Masterbuilt controllers.At the risk of sounding like a girl......why do u have those metal U bolts (?) on there? Where in the electric smoker would u put that?
I use the tray for mes with the mailbox I haven't tried the tube but some people say it puts off to much smoke for inside the mes , others use the tube with dust instead of pellets and say it's fine, will say tubes will burn better in low oxygen environments. I use the tube in my pellet grill where the tray wont stay lit.Do u put the tray /tube inside the MES?