Yes, that is what I was asking about.
The problem is that, after a restart, Firefox and other software (online trading platforms, Excel, etc.) that I use function properly for a time, but then (especially if I leave and it goes idle in sleep), everything begins to slow down, hang up and not work. At this point, a restart will still recover performance, but not for long.
In addition, a message to the effect that there is no more space available for application memory. This notice disappears after a restart, but reappears after sleep mode. I have 4 gb ram and about 85% of 1 Tb of hard drive available. There is more memory installed that has not been functional for some time.
In a few minutes, I need to step away for awhile, so will watch for your reply but may not respond further for two hours or so. Thanks.