Sadly, we hear of this over and over.
This is usually due to a defective or loose magnetron causing electrical interference and disruption in the control circuit board.
If your magnetron was recently replaced, it may have loose mounting nuts or bolts or maybe the wire mesh RF gasket was not installed or got pinched.
It may also need a new high-voltage diode and stirrer, and the cavity may be affected.
GE had a campaign (but not a recall, mind you!) covering several models.
Details are in their bulletin at http://207.234.249.73/mwd/ge_mw_mag_kit_bulletin.pdf
Even if your model is not on the list, the same problem can occur, requiring a kit. I just think the difference is that GE has stopped paying for the repairs.
The parts kit (that GE used to pay for) is part # WB27X10489 and is shown here: http://207.234.249.73/mwd/wb27x10489_ge_mag_stir_kit.jpg
If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.
You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
We're happy to help and we appreciate your thoughtful rating of our answer.
Capacity
Oven Capacity (cu. ft.): 1.6
Features
Wattage (IEC-705 Test Procedure): 1000
Cooking System: CircuWave™
Plus
Power Levels: 10
Style: Over-The-Range
Clock: Plus AM/PM
pad
Electronic Scrolling Digital Display: Yes
Electronic Touch Controls: Yes
Kitchen Timer/Timer (On/Off): No/Yes
Variable Scroll Speed: 5
speeds (sub-pad w/ AM/PM)
SmartControl System - Concurrent Programming: Yes
SmartControl System - Help Pad: Yes
Beverage (Convenience): Yes
Cook (Convenience): 9
Codes
Popcorn (Convenience): Yes
Reheat (Convenience): 6
codes
Add 30 Seconds: Instant-On
Child Lock: Yes
Cooking Complete Reminder: Yes
Defrost Type: Auto
& Time
Delay Start: Yes
Display On/Off: sub-pad
w/ zero
Express Cook: Instant-on
1-6
Reminder (24 hr): Yes
Time Cook: I
& II
Time Preference: Control
Enhancement (1/9)
Turntable: Glass
Turntable On/Off: Yes
Turntable Size (in.): 13-1/2
Cooktop Lighting: Bright/Night/Off
Night Light: Auto
Rack Type: Wire
Oven Rack
Sound Volume Control: 4
levels
Easy Mount Installation: Yes
Exhaust Fan: 2-Speed
Appearance
Case Color: Black
Color Appearance: Stainless
Steel
Door Color: Black/Stainless
Steel
Handle: Designer-Style
Weight And Dimensions
Approximate Shipping Weight: 63
lb
Overall Depth: 15
5/8"
Overall Height: 16
3/16"
Overall Width: 29
7/8"
Cavity (W x H x D): 20
31/32" x 9 3/8" x 14 3/16"
Power/Ratings
Electrical Input - 120V Amperage: 15
Electrical Input - 120V Watts: 1480
Frequency (MHz): 2450
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