Been having the same issue.. Miner just freezes after 2 or more hours.  Unable to Ctrl-C out of the window and forced to close. 
Been working on a script to email me when it goes down (Ethminer or Geth) and possibly reboot because this is becoming such an issue... One good thing about using a pool is the notifications. Also see issues with Geth when you lose internet it does not seem to reconnect requiring a restart as well...  Mining is so much fun. lol

Illegal memory access...most likely corrupt DAG. Is this all on 1070s?

Got same problem with a GTX750ti and what it is ?
Corrupted Memory on this card.
Replaced this card and everything works fine again.

No, still on 670 until 1070's arrive

I too get the illegal memory access error on my 1070s,but it's only when I really push the over clock.

Dear Genoil,
could you list options in OP?
Regards

Ethereum stratum?

Try ethminer with --help flag

That's why I asked for list options in OP

1.1.7 is out. Adds support for pools using eth-proxy-style stratum. Main reason to support it is because of the upcoming choice between soft-fork or not. Supporting more pools will allow users to choose between more pools that choose the path they support, without having to change to a different mining client.

Removed flags:
-SV (replaced by -SC)
-ES (superseded by -SP)

Added flags
-SC [n] Where n is 1 (async, default) or 2 (sync) stratum client. async uses a bit more CPU but has working --work-timeout, wheras sync client doesn't have that (yet).
-SP [n] Where n is 0 (stratum, default), 1 (eth-proxy) or 2 (nicehash). Stratum protocol to use.
-SE [e] Where e is email address. Used by eth-proxy. In some pools (like nano) you can also add it to the worker name using.

Example dwarfpool:

ethminer.exe -U -S eth-eu.dwarfpool.com:8008 -SP 1 -O 0xeb9310b185455f863f526dab3d245809f6854b4d.worker -SE genoil@hotmail.com

https://github.com/Genoil/cpp-ethereum/tree/110/releases

Yes it could still have bugs, tested major pools (dwarf, f2, nano) with success, but something may have slipped through. Thanks for testing!

yes. you know it works when it just says "Connected!" instead of "Connected to stratum server at blah blah"