Keyone loosing contact with SIM

My Keyone keeps loosing contact with its SIM and showing the Insert SIM message. This does not appear to have any connection with movement of the phone or jarring it. For example the SIM can be in contact when the phone is put in its cradle to charge overnight and then the following morning be showing it has no SIM. Most frustrating and all suggestions welcome.

I would try a new SIM.
(if you recently handled the SIM, perhaps a quick wipe with a microfiber cloth may help)