Seems you might be hitting the following bug CSCdv00403 it is 3600 specific and is in 12.2(4)T and 12.2(4)T1-3 and fixed in the following release 12.2(4.1), 12.2(4.1)S, 12.2(4.1)PI, 12.2(5.2)T, 12.2(4.02a)DA, 12.2(6.4)PB, 12.2(6.4)B. So i would go for the latest .5T train. There are no release notes for this DDTS so cant give you much info just the fact that it is there..:))))
NB!! You could try and boot the box on your 12.1(5)T image as the bug does not appear to exist in this image.
Also be aware of this DDTS in 12.2 with 3600 CSCdv31004 - squeeze in progress...seen after squeeze of flash complete it's fixed in 12.2(6.6), 12.2(6.6)T, 12.2(6.6)PI, 12.2(6.8)DA, 12.2(6.8)S, 12.2(6.08a)DA, 12.2(6.8)PB. This does exist in all 12.1(5)T release however is a Severity 5 (So not so hectic) the other DDTS mentioned here are Severity 3...:))
There are other bugs in 12.2 that relate to 3600 IFS but they are concerning the PCMCIA flash option.
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