There is no limit in the module, afaik. Try to see if some gateways are in no probing mode
via rpc command. Also, be sure you capture all the network interfaces or enable
event_route[tm:local-request] and add there some log messages to see if local OPTIONS
requests are sent.
You should upgrade to latest 5.2.x to be sure is not a side effect of some fixed bug since
5.2.0.
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