I met with this device the same problem with a previous brand wrist blood pressure monitor Sanitas 12.99 bought at Lidl: untimely loss (2 in 1 months) from the date it then be reintroduced. However, while this incident erased all measures and medium wrist blood pressure monitor, the Beurer BM 35 has retained the measurements for each user and also displays the average of 60 measurements. Only memories, over 7 days, morning (from 5:00 to 9:00) and dinner (17:00 to 21:00) are erased, which remains an acceptable minor flaw!