Modem Firmware - Poor Internet Speeds

Have a Motorola Surfboard SB6141

I get occasional resets/reboots on modem (per log) and sometimes VERY poor download speeds (less then 1Mb at times) while my upload speeds stay very consistant.

Mulitple calls to support and one technician visit to the house say everything is "perfect" on their end.

I think it may be my modem, before I purchase a new one I want to know if my firmware etc. are what they are supposed to be.

Model Name: SB6141
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.10-SCM00-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 7.0
Serial Number: 374781334121654310020022
Firmware Build Time: Oct 29 2012 18:07:13

Any assistance in this matter would be greatly appreciated.

Thanks inadvance,

Sean