Trunk lines calling phones

Hi everyone, I’m very new to FreePBX. I’ve set up a SIP trunk and a couple of IP phones. All working very well.
Only problem I have is, randomly, I get my trunk calling my internal phones. When I answer, the line disappears. Random times, all phones.

Some background info, my server is on a Vultr virtual server.

Is there a way to stop this?

Thanks all.

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