I dont think the issue is Firmware frankly. It appears to be a hardware issue with the ISY. I've tried different Ethernet cables, different switch ports, a different switch and hard-setting the switch ports to 100-full and 10-full. I'm using an Aruba enterprise class POE switch (no consumer class garbage). I've verified no packet loss elsewhere on my LAN.

I dont know of anything else to try on the ISY. Thoughts? Suggestions welcome or time to replace it?

Thanks!

ISY Log Shows: 

Wed 2021/04/21 06:22:59 PM    System    -5    Start    
Wed 2021/04/21 06:23:00 PM    System    -110022    /CONF/INSTENG.OPT    
Wed 2021/04/21 06:23:00 PM    System    -110012    /CONF/INSTENG.OPT    
Wed 2021/04/21 06:23:04 PM    System    -110022    /DEF/F6/I1/NLS/EN_US.TXT    
Wed 2021/04/21 06:23:05 PM    System    -110022    /CONF/UXT.BIN    
Wed 2021/04/21 06:23:05 PM    System    -110012    /CONF/UXT.BIN    
Wed 2021/04/21 06:23:06 PM    System    -7153    ID 0002 :err=0, tag='/group', num=20, nest=5, o    
Wed 2021/04/21 06:23:06 PM    System    -7153    ID 0003 :err=0, tag='/node', num=28, nest=5, of    
Wed 2021/04/21 06:23:06 PM    System    -7153    ID 0004 :err=0, tag='/node', num=28, nest=5, of    
Wed 2021/04/21 06:23:06 PM    System    -7153    ID 0005 :err=0, tag='/node', num=28, nest=5, of    
Wed 2021/04/21 06:23:06 PM    System    -7153    ID 0006 :err=0, tag='/node', num=28, nest=5, of    
Wed 2021/04/21 06:23:06 PM    System    -7153    ID 0008 :err=0, tag='/node', num=28, nest=5, of    
Wed 2021/04/21 06:23:07 PM    System    -170001    UDQ:Queue Full: ELK : Task[13] Modules MOD-CB-Elk Secu pty=24    
Wed 2021/04/21 06:23:28 PM    System    -170001    UDQ: Queue(s) Full, message ignored    
Wed 2021/04/21 06:23:53 PM    System    -170001    UDQ: Queue(s) Full, message ignored    
Wed 2021/04/21 06:24:04 PM    System    -170001    UDQ: Queue(s) Full, message ignored    
Wed 2021/04/21 06:24:31 PM    System    -170001    UDQ: Queue(s) Full, message ignored    
 

Edited April 28, 20214 yr by TheEther

I'll also add this ISY-994i is 10 years old (or very close to it). Been a great unit. Ordered a replacement today. I've been noticing my Insteon stuff has been flaky lately and it appears due to Tcp timeouts, that'd be the reason.

Did you ever try a replacement power supply?

We have seen reports of strange things happening. I had failures on an ISY99i and my present ISY994i.

If you are using a 2413S PLM they also have a reputation of failing and strange things happening

In my last house I had similar packet loss when my ISY was connected to a non-managed 5-port TP-Link switch that also had an Amcrest IP camera on it.  It appeared that the ISY couldn't handle all the multicast traffic coming from the camera.  Once I moved the camera over to my main managed switch, all was ok again.

Wanted to follow up on this. After buying a new ISY 994i ZW+ IR/Pro and transferring everything over. I had the same issue. So... Packet captures, wire sharks and switch mirror ports fun ensued. Narrowed it down to my Plex Media Server. ....and making a very long story short. Disabling the DLNA server in Plex Media Server (PMS) fixed the issue. 

Good news is I have a shiny new ISY.