Imac freezing- running Mountain Lion 10.8.4

Hi all - Running Mountain Lion 10.8.4 on an Imac 2.4ghz Intel Core 2 Duo with 3gb RAM. Have recently (last 2 weeks) started to get problems with system freezing on waking up from sleep, only way to cure is to force shut programs then turn off pc and reboot. Have scanned the net for similar problems and found that it seem to be becoming a common one, followed various bits of advice and have found that using the console feature and the logs it provides that my problem seems to originate with Time Machine. I had gone through the process of removing all my peripherals except TM and started to read the diagnostic logs on console for a common thread and noticed that there were constant references to Tm (see below) and backup alias.
com.apple.backupd-helper[1741]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
I decided to disconnect my TM and see what the result was - firstly I noticed there was a definite increase in the speed of my system and secondly that if I let the system go to sleep by itself when woken it worked fine, however if I forced sleep it froze on waking up, below is snapshot of the log at 3.00am in the morning
11/07/2013 02:59:48.000
kernel[0]
IOPMrootDomain: idle revert
11/07/2013 03:00:17.347
com.apple.backupd-helper[1399]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
11/07/2013 03:00:18.698
com.apple.backupd-helper[1401]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
11/07/2013 03:02:12.718
StatusMenu[189]
receiveSleepNote: NSWorkspaceWillSleepNotification
11/07/2013 03:02:12.723
StatusMenu[189]
receiveSleepNote: NSWorkspaceDidWakeNotification
11/07/2013 03:02:12.000
kernel[0]
PM notification cancel (pid 59, WDDMService)
11/07/2013 03:02:12.000
kernel[0]
IOPMrootDomain: idle revert
11/07/2013 03:02:42.769
com.apple.backupd-helper[1402]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
11/07/2013 03:09:47.314
StatusMenu[189]
receiveSleepNote: NSWorkspaceWillSleepNotification
11/07/2013 03:09:47.000
kernel[0]
PM notification cancel (pid 59, WDDMService)
11/07/2013 03:09:47.320
StatusMenu[189]
receiveSleepNote: NSWorkspaceDidWakeNotification
11/07/2013 03:09:47.000
kernel[0]
IOPMrootDomain: idle revert
11/07/2013 03:10:17.363
com.apple.backupd-helper[1404]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
11/07/2013 03:14:47.324
StatusMenu[189]
receiveSleepNote: NSWorkspaceWillSleepNotification
11/07/2013 03:14:47.000
kernel[0]
PM notification cancel (pid 59, WDDMService)
11/07/2013 03:14:47.339
StatusMenu[189]
receiveSleepNote: NSWorkspaceDidWakeNotification
11/07/2013 03:14:47.000
kernel[0]
IOPMrootDomain: idle revert
11/07/2013 03:14:47.629
StatusMenu[189]
receiveSleepNote: NSWorkspaceWillSleepNotification
11/07/2013 03:14:47.766
StatusMenu[189]
receiveSleepNote: NSWorkspaceDidWakeNotification
11/07/2013 03:14:47.000
kernel[0]
PM notification cancel (pid 59, WDDMService)
11/07/2013 03:14:47.000
kernel[0]
IOPMrootDomain: idle revert
11/07/2013 03:14:47.876
StatusMenu[189]
receiveSleepNote: NSWorkspaceWillSleepNotification
11/07/2013 03:14:48.016
StatusMenu[189]
receiveSleepNote: NSWorkspaceDidWakeNotification
11/07/2013 03:14:48.000
kernel[0]
PM notification cancel (pid 59, WDDMService)
11/07/2013 03:14:48.000
kernel[0]
IOPMrootDomain: idle revert
11/07/2013 03:15:17.381
com.apple.backupd-helper[1406]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
11/07/2013 03:15:17.878
com.apple.backupd-helper[1407]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
11/07/2013 03:15:18.108
com.apple.backupd-helper[1408]
Not starting Time Machine backup after wake - failed to resolve alias to backup volume.
Appreciate that this possibly relates to me not having the TM connected - will reconnect and see what the result is and follow up.
I have spoken to our local Apple shop however they have not heard of the problem! The advice given is to save everything and do a clean install, however have noted on the net that this is not necessarily the answer to the problem. Am a bit loath to place my Imac in the shop for many hours work and not necessarily get the problem solved.
So any ideas as to where I go from here please!
Many thanks
B

Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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