6 months ago, on RouterOS version 6.43 contact mikrotik support, (support@mikrotik.com) because it detects an IGMP PROXY malfunction in mikrotik. And is that a moment given randomly the router begins to try to negotiate with the router at the other end in IGMPV3, theoretically IGMP PROXY for Mikrotik is only compatible with IGMPV2 so I found it very strange.
The case was handled by a Mikrotik technician named Arturs Z.
After numerous tests mikrotik confirmed me that it was a bug and connected by SSH to my router and forced the IGMPV2 in the system by the following comado on the file system.
echo 2 > /proc/sys/net/ipv4/conf/all/force_igmp_version
After this test mikrotik did not respond again, I have sent more than 20 emails asking about the roatmap to correct the bug and the response has been total silence. That I find it unacceptable. that they treat a customer who has paid more than 1000€ in a product of theirs.
I attach the complete mailing thread
https://drive.google.com/open?id=1zBG9Ji6Gcy6Uqe4tlklm5aHQEB6k5xFV