Forerunner 55 Update 11.02 accelerometer issue

FR55 firmware was updated but issue persists. One of the users provided me raw accelerometer signal:

the signal is recorded (captured by my app and saved in fit file) however it looks artificial. User did couple of swings of his hand in the air and saved activity but when reviewing the singal (picture attached above) it looks like couple series of repetable signal with EXACT same acceleration values being registered over and over again with exact interval. the signal is sampled 25/sec frequency and repeats at exactly same rate. 

Please advice the root cause of that issue. Similiar behavior was reported to me by other users of FR55 so I guess it is not malfunction of single watch device.

For comparison here is how accelerometer signal looks like while working properly:

(user hand swings are clearly recorded and visible - without any repetitive patterns)

Hi, I developed a Canoeing app ( https://apps.garmin.com/en-US/apps/23e5e52a-9a22-4120-bd63-39ba9b3cba3c ) that has exactly the same issue with the accelerometer only on the Garmin Forerunner 55. Many users complain that my app doesn't work on the Forerunner 55; some say it usually works but has now stopped, while others say it works perfectly fine on their Forerunner 55. This has been happening for quite some time. I don't own this watch, so I cannot analyze what is happening. In the Garmin Connect simulator, it works fine, but it doesn't in real life.

For me it looks like after one of the recent FW updates the accelerometer signal is not coming from sensor but from some dummy dataset as if it was broadcasting the simulator signal instead. Hope Garmin will follow up on it soon as a lot of people are reporting me this issue on Fr55.