;)Could be something loose , but as a precaution check your patch cable from rig to power meter, if rig draws anode and grid current the power is not getting to the intended point.
After that, could be all of the mentioned above.
Rotate the band switch a couple of times, then on the band in use , on rx move it slighly either one way ot other way. TX and see if it clears.
Could be the coupler to finals if it does.
73 de William, ZS4L / ZS5WC