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When there is an exclamation mark on any device it most probably there is an interupt (IRQ) or any other resource is conflicting.
You will need check which one is it and need to disable either one of the conflicting device.
Once you are able to resolve this matter the exclamation mark will go away.
Anyway Network Adapter is seldom the cause of frequent disconnection.
Frequent disconnection usually cause by the splitter/microfilter, poor copper cable or connector quality or parallel line before the line that is going to the modem. Try to do a direct single (from the main line from the pole) to the modem.
Computer setting also could be a couse some time, also check for virus activity and trojan horses.
If all fails your designated port given by your ISP might need to be reset/replace or they might need to move your connection to different location.
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