Air carrier pilot reported that during an autocoupled approach the glide slope indicator and yoke began oscillating; followed by an uncommanded disengage of the autopilot. Pilot completed the approach manually.

Narrative

Suspected 5G EventOn an Autopilot coupled ILS approach to 7L in Anchorage we intercepted the glide slope at 2;000 ft. about a mile and a half outside the final approach fix. Just after the intercept the glide slope indicator on the PFD (Primary Flight Display) began rapidly bouncing between 1/2 dot low to 1/2 dot high. The yoke correspondingly began oscillating in short rapid forward and aft movements. The aircraft flight path remained stable. My first thought was that there was a temporary ground interference with the glide slope antenna. The oscillations began diminishing as we crossed the final approach fix at 1;600 ft. when we got a NO LAND 3 EICAS Caution advisory. About five or six seconds later the Autopilot disengaged un-commanded. I cancelled the Autopilot wailer and completed the approach manually. The entire approach was accomplished in VFR conditions This event occurred at approximately XA:20Z.I didn't get a chance to read the 5G Interference bulletin until after we landed in Anchorage. When I did it occurred to me that our event may have been a 5G interference issue.