Odd, neither System nor Application Windows logs have the event logs about the dhcp issue.
Could you check when these events started to show up, and check whether a system restore point is available from prior these events (if any), this will be as some sort of a last resort solution.
Have you been using Avast Driver Updater, Advanced SystemCare and Driver Booster 5 to update drivers and 'take care' of your system?
I'm asking, because the drivers of these update programs can affect your issue whereas Advanced SystemCare is known for causing issues (and has some statements that are not (entirely) correct).