I have 3 year old 21" iMac. About a year ago Bell replaced my white modem with the black Sagemcom 2864. (Everything worked perfectly before this.) The internet started freezing when I was surfing or streaming. Sometimes the entire computer froze, (mouse included) and I was forced to do a hard shut-down. Sometimes I would get a kernel panic too. Sometimes I could just put it to sleep for a second and then it would work again. I called Bell a dozen times over 6 months, had the modem replaced with another black modem, same issue. Sometimes it freezes up my computer 3x or more a day. After a dozen calls and a second modem, Bell said it's not them. So I called iCare a dozen times and dragged my desktop into Apple FOUR times. Because of the kernel panics, a lot of the experts agreed that it must be the computer. They ran every test under the sun, like 10x. The motherboard was replaced and engineers ran tests from California - they could not duplicate the problem. I bought a UPS to see if it was something to do with the power levels coming into my house. Nope. Now what?? Any suggestions? Could it be the modem model? What else am I missing here? Anyone else have these issues? Would love some help or advice on this! P.S… Some of the trouble-shooting already completed: All upgrades. A complete erase/reset of my computer. Logged in under another user. Logic board replaced.