cm10 S2 and Rotel RX-1050 when bi-wired on A and B speakers Rotel overheats easily


got B&W cm10 to replace 686 and started by bi-wiring them using A and B speakers. But the receiver overheats and turns itself off. It is 100W per channel which I thought would be enough. I went to regular wiring, receiver gets warm but does not overheat.
Thoughts? 
thanks in advance.
petarr

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