LT6235 op amp hangs in LTSpice simulation

I'm trying to run an AC Analysis on a 9-pole 3 kHz low pass filter using the LT6235 model. The simulation does not seem to converge, even after a half hour. When I replace all of the LT6235's with LT6238s, it runs in a few seconds. When I replace the LT6235 with AD8674, it runs virtually immediately. The filter was originally designed in Analog Filter Wizard. At one point I saw an error message relating to "DC operating point not found". I put in ".options cshunt = 1E-15" just in case.

The simulation seems to run fine with two other op amp models but not with LT6235. Is this a model issue or something a little more obscure?

Thank you



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