My OVMS won't stay installed in January 2019 and worked great until sometime in 2021, it stopped staying connected to cellular. I thought the issue was 3G->4G, but having same issue after upgrading to 4G. I checked hologram.io(cellular provider) and I still have credit in my account. Additionally, hologram says its connected to the cellular modem, but the OVMS app says not connected. The only way to temporarily fix it is to power cycle the device. It will start sending data to the app for a short period of time and then stop again. Any ideas on how to fix it?