# SDM120 (MBus) Meter Freezing / Drop-out **URL:** \ **Category:** Emoncms\ **Tags:** sdm120c, mbus\ **Created:** [28 June 2022 12:57 UTC](https://community.openenergymonitor.org/t/sdm120-mbus-meter-freezing-drop-out/20765 "2022-06-28T12:57:27Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![TrystanLea](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/trystanlea/32/31_2.png) [@TrystanLea](https://community.openenergymonitor.org/u/TrystanLea)\ **Post date:** [28 June 2022 15:25 UTC](https://community.openenergymonitor.org/t/sdm120-mbus-meter-freezing-drop-out/20765/2 "2022-06-28T15:25:07Z")
Hello Ben. Unfortunately I have also noticed this on a couple of systems, not all, but exactly as you describe, sometimes it can be few months, other times a few days. It seems there is a reliability issue with the MBUS variant of the SDM120. I tried a few different things such as slowing down the readings and reducing the number of retry attempts but no luck in getting better reliability. I also haven’t been able to reset the meter when it has crashed via a software fix, as you say it requires a breaker reset. We’ve started to recommend installing the Modbus version with a separate modbus reader, that one seems to be rock solid from our experience so far. I realise I need to update our documentation to reflect this, I will do that now. I wonder if the supplier might take the MBUS version back and exchange for a modbus variant? Sorry I should have posted up here about this sooner, I appreciate that the issue is more than a bit frustrating! --- _[View the full topic](https://community.openenergymonitor.org/t/sdm120-mbus-meter-freezing-drop-out/20765)._