7.x series supports more cipher suites for decryption. There are chances when firewall is not able to decrypt traffic because of unspported cipher suites. Check the following document. 7.0.4 is better then previous version.
From what I recalled there are only 2 additional ciphers that version 7.0.X software is capable of processing over version 6.1.X software.
When version 7.1.X software comes out there's projected to be many many more supported cipher suites. The instability you're alluding to was in PAN-OS software 7.0.3 and <. Version 7.0.4 is far more stable, especially WTR to SSL.
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