Yosemite login freeze after sleep

I've seen several threads to this effect, but none that have resolved my issues with logging in successfully after sleep for a relatively long time, or after working with an external monitor, then sleeping and waking/logging in...in these cases I'm frozen and have to force shutdown, then reboot. I'm on Yosemite 10.10.2 (was same with 10.10.1) on a MacBook Pro (Retina, 15-inch, Late 2013; 2.6 GHz Intel Core i7 processor; 16 GB 1600 MHz DDR3 memory) with last Console log entry below (quite a few minutes prior to attempted wake). I don't see errors at time of freeze; next thing is my reboot. Ideas?...Thanks...Jim P..

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Jan 29 19:40:11 JDPRubato kernel[0]: PM response took 3142 ms (31, powerd) Jan 29 19:40:11 JDPRubato kernel[0]: AppleCamIn::systemWakeCall - messageType = 0xE0000280 Jan 29 19:40:11 JDPRubato kernel[0]: [0x6c4c826000, 0xfff0000] Jan 29 19:40:11 JDPRubato kernel[0]: [0x12d281000, 0x9010000] Jan 29 19:40:11 JDPRubato kernel[0]: [0x1cda1e000, 0xd21e000] Jan 29 19:40:11 JDPRubato kernel[0]: [0x66eb9000, 0xbde2000] Jan 29 19:40:11 JDPRubato kernel[0]: [0x7409eb0000, 0xb71a000] Jan 29 19:40:11 JDPRubato kernel[0]: [0x22361d000, 0x28e6000] Jan 29 19:40:11 JDPRubato kernel[0]: [0x0, 0x0] Jan 29 19:40:11 JDPRubato kernel[0]: ARPT: 8545.920881: AirPort_Brcm43xx::powerChange: System Sleep Jan 29 19:40:11 JDPRubato kernel[0]: ARPT: 8545.920884: wl0: powerChange: *** BONJOUR/MDNS OFFLOADS ARE NOT RUNNING. Jan 29 19:40:11 JDPRubato kernel[0]: AppleCamIn::systemWakeCall - messageType = 0xE0000340