I have a 2018 BLRO and have noticed this problem. I have taken it to the local service center twice to be regulated. This is about 3-6 months ago.
What I can say for sure is that when the watch is wound and kept on wrist it maintains time within 2 sec per day. If left to run down, it loses time increasingly.
I have not taken any data but after reading these threads its clear mine has this problem. I will try to gather some data and post it.
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116520 Daytona white, 116500 Daytona black, 126600 SD, Speedmaster Pro, 116710BLNR GMT II, Speedmaster trilogy 57, Breitling Navitimer A23322, Seiko SKX007J, Seiko Mini turtle PADI, Seiko 5 Sport Diver.
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