Well there are many other forum members using AdAware Or Spybot S&D with avast and no flood of posts relating to them freezing.
You don't mention anything about your system, CPU, RAM, OS, etc. ?
You don't say what the sensitivity of the Standard Shield is, Normal is the default ?
Both of those tools if they are primarily on-demand scanners, is this what you are doing (running a scan) when this freeze occurs ?
If so my personal opinion (not everyone agrees
) is that you should pause the standard shield provider when running scans with other security applications. The reasons:
1. as they open files to scan avast will scan those files also duplicating scanning.
2. if malware is detected and avast plus the other scanner both recognise the same malware signature one will be trying to gain control which can lead to conflict between the two scanners.
By pausing the standard shield you avoid both possibilities and your scan should complete sooner.