Netgear switches crash network

I have a Netgear GSM7312 and everytime I plug a Netgear JGS524 into a port the GSM switch stops working. I have three of these switches and it happens on all. Done all the basic checks so far...

I can see this error in the log when the network is down
6> Jan 6 19:52:05 0.0.0.0-1 UNKN[287491232]: dot1s_txrx.c(158) 70678 %% dot1sBpduReceive(): paddedBufHandle is L7_NULL

and this log when its up
<5> Jan 6 19:52:41 0.0.0.0-1 TRAPMGR[288835912]: traputil.c(663) 70679 %% Spanning Tree Topology Change: 0, Unit: 1

An help or advice?
BerryGardensAsked:
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Ben HartConnect With a Mentor Commented:
well.. I'm starting to lean towards maybe just a flaky switch then.
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Ben HartCommented:
First thing I'd think is STP halted both interfaces.. but I'd also think that if STP was being kicked there'd be a reference to 'Spanning tree" in each event.. not just the one.
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BerryGardensAuthor Commented:
agreed. I have two other netgear l2 switches on other ports with no issues. I've compared detailed settings and both look identical. Very strange! I've plugged in an old netgear and that works on the same port. Seems to be only this model is the common factor which I can't believe.
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Ben HartCommented:
Is there any config on the troublesome netgear to be cleared?
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BerryGardensAuthor Commented:
No GUI on these switches. I even used one out of the box.
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Ben HartCommented:
wow.. so teh GSM stops forwarding packets on all ports when you plug in the JG right?  crossover cable or straight through?
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BerryGardensAuthor Commented:
My thoughts exactly. Cable is straight through Cat5e.
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BerryGardensAuthor Commented:
Sorry yes stops forwarding.
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BerryGardensAuthor Commented:
I agree. Thanks for the help.
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