This excerpt from the user's manual can explain the problem of your door latch, door lock.
"... Each time you press this button, the following image is displayed. - When an image moves up and down during a pause.42 PM `30 mac001 300DPI 120LPI Recording with the VCR DVD VCR TITLE / PBC OPEN / CLOSE MENU PR DISPLAY OUTPUT CONFIGURE ENTER RE TU RN / OK ZOOM PR AUDIO E CL AR / 3D REPEAT UNDER-TITLE PREV PLAY / PAUSE NEXT PROGRAM CLK / CNT MARK SEARCH REC SPEED / ANGLE TRACKING SYSTEM TV / VCR 30 1 2 34 5 6 7 ON / OFF BUTTON VIDEO OUTPUT SELECTOR TRANSMITTER / PAUSE STOP RECORDING SPEED NUMBER OFRECORDING Press the  button to turn on the unit. There is no disc in the disc tray. Solution Insert the plug firmly into the socket. Select the correct video input on the TV so that the image from the DVD recorder appears on the screen...."
BLUESKY BM02040, BM020B4, BM0208, BM020-4
Manufacturer's part price is £29.83 Discount for bulk (starting at 10 units), £28.85 per unit
This manufacturer part is recomended by BLUESKY, which gives it a 10/10 rating.
This spare part is recommended for your BLUESKY BM020-4 microwave oven .
All spare parts are new and come with a 1 year warranty
① Carefully check your BLUESKY microwave oven's product number
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