Problem solved, more or less...
after some testing I realized, it is not the SSD, causing the problem.
The failure only comes up, when the external monitor is connected and I try to wake up the system then from stanby or hibernate... with the internal screen only, it works perfectly! What do you suggest?
Graphics driver maybe?
I should annotate, that I recently installed the single ATI HD 6990M into my M17x R2. The problem seems to exist since this upgrade.
TechTarget provides enterprise IT professionals with the information they need to perform their jobs - from developing strategy, to making cost-effective IT purchase decisions and managing their organizations' IT projects - with its network of technology-specific Web sites, events and magazines.