Canon 600EX II-RT drops link- HELP!

[Phillyphoto]

Scenarios I have tried: 

Using Canon Transmitter ST-E3-RT as the master and (2) 600 EX II-RTs as slaves.

Using A 600EX as master and B 600EX as slave.

Using B 600EX as master and A 600EX as slave. 

I get the same result of the slave dropping link. The time varies. Sometimes it drops link in 4 mins, sometimes 10mins, sometimes 20 or more minutes. The only way to relink them is by turning everything off and back on.

All channels are the same. Yes, I have scanned for the best connection as well as every other channel and AUTO.

All IDs are the same. 

Not near a wifi-router or airport, I'm in a row home in Philadelphia. 

Using NiMh rechargeables and using freshly charged batteries for every test. Batteries are about 2 years old. 

I have spoken to 2 Canon service reps and neither of them has any idea what the problem is. I really don't have the money to spend on sending everything in for "repair". 

Any help is greatly appreciated, thanks!

[7thWheel]

I am having the same issues with my EL-1's when I take them out to take photos.  I shot the Halloween Parade two days ago and my connection must have dropped about 10 times. Not exactly the result I was looking for when I dropped the $$ on the two flashes. 

[7thWheel]

I updated the firmware on both of my flashes and had the same issue after I did.  

[kristieschram]

I did the same and it funny help

[kristieschram]

So everyone’s having this problem and canon is doing nothing about it ? what are we supposed to do?

[kristieschram]

I think everyone should get a refund

[kristieschram]

Exactly!  They are ignoring.   I’m not sure how to go about a class action complaint.   Maybe it’s time to call better business or find an attorney friend . 

[kristieschram]

Yes! 

[7thWheel]

I would much rather a fix or a trade in but if push comes to shove I would totally join a class action suit. I have missed out on a lot of good photos as a result. 

[7thWheel]

I am actually having the opposite happen.  At home they seem to work find and stay connected.  When I went to the Halloween Parade, Mermaid Parade, Asbury Park Zombie Walk and Easter Parade this year I had the issue of the flash disconnect.  

[kristieschram]

Me too.  They kept going off during to studio sessions.  The clients loved the session, but said hopefully the next time my lights won’t be broken. Very embarrassing.