The SBB appears mostly in "Safari" and I am still on OSX "Mountain Lion". Thanx to all for your replies.
I plan on upgrading when Yosemite 10.10.3 comes out in the very near future and this is why I upgraded my RAM from 4GB to 16GB last month. I bought two (2) "Lifetime Brand" 8GB RAM sticks from a Apple Authorized dealer here in Costa Rica at a cost of $245.00 installed.
I have no external drives connected to my Mac Mini, however, I am using Carbon Copy Cloner and a WD Passport 500 GB portable drive in which I "clone" my Mac Mini HD once-a-month as a backup.
No, I have not tried a OS Reinstall as yet.
My Applecare coverage on my Mac Mini expires in August, 2016, so, if this continues I will take it to one of the Apple Authorized Dealers here in Costa Rica for a check-up. That's the great thing about the Mac Mini in which you unhook a couple of cables, put in your backpack anda then off to the races for a needed Apple Repair.
Sorry to say there are NO Apple Stores as yet here in Costa Rica or even in any of the other Central America Countries. I understand that they have recently opened an Apple Store in Mexico, however, this country is not part of Central America.
Another thought, I am accessing my ISP via a Apple Express Router(2nd Generation) which is located in an adjacent bedroom and could this be the source of the problem?