First try the simple checks:

• Fully charge the battery.
• Clean the battery contacts on both the battery and inside the camera.
• Remove the lens and carefully clean the electrical contacts on the lens and camera mount.
• Remove the main battery, and if accessible also remove any backup battery, then leave the camera without power for several hours before reinstalling.

If those steps do not change the behavior, the safest next step is to contact Olympus/OM System support or the seller, especially since the camera is only a couple of months old. This may be a known fault, and they can tell you whether there is a user fix or whether the camera needs service or replacement.

One community reply suggested applying alcohol to a small lever, but that is not a standard manufacturer-recommended repair and risks damage if done incorrectly. It’s better to stick to cleaning contacts and power-reset steps unless official support instructs otherwise.