Just guessing here, but it looks like the noise is caused by light bounced off something highly reflective (like a mirror/metal) or passing through something refractive (clear glass/frosted glass). There could be many solutions to this, such as: moving the lights to a different position, disabling light-emission for the light sources and adding some invisible light sources instead, using rayswitch material to exclude some surfaces from GI contribution.
Another idea is LightMix - are you using it? If you create a room with dim lighting, set up LightMix, and then boost light intensities in LightMix, you can easily end up with strong noise / fireflies. If that's the case, you can try increasing the light intensities in the scene instead, or using the ">Scene" button in LightMix that bakes light intensities from the VFB into the scene lights (I would suggest saving a backup of the original scene in this case).
It would be best to check the scene itself + get some more details such as which version of Corona you are using, so you are welcome to submit a new support ticket:
https://support.chaos.com/hc/en-us/requests/new