Loss of data

Anyone else experiencing "Inverter lost".?Yesterday I lost all data yesterday from 02:00 until around 1300 with the "lost " message. It came back only to go again this morning around 02:00 and still isn't back. I have a wireless connection from the inverter to the consumer unit. Givenergy recommended restarting my router, didn't work, likewise restarting the inverter, firmware update and reinstalling the app. Any ideas?

I have a tp-link between the garage and the study (via the mains circuit) which I have to restart to fix the occasional Invert Lost situation. Not sure why it occurs.