I sometimes get irregular heart beat symbol on my blood pressure monitor when my heart rate is normal less then 100 and bp also normal it comes only 1-2 time then does not come. I have no heart problem I have some stomach related issues like ibs and acidity since many years I have had ecg 3 time in my life all the times due to hyper acidity last was in january 2020 it was also normal. The irregular heart beat symbol appears in the evening only.