Modem setup question

just a quick update and a question about power levels. The install went fine and interent seems ok. The only hiccup was on the 2nd day- that next morning apparently had dropped offline overnight and would not reconnect til after I unplugged the power AND unhooked the coax. That hasn't happened again. I logged in to the modem to have a look around and noticed the upstream levels sit at around 49-52 occassionally 54. Speed/connection remains and seems ok. Are these numbers within spec? The downstream are all around -3.0-3.7, and SNR's 37-39dB. When looking at the event log I see LOTS of errors "crtitcal/warnings/notices" what looks like T3's T4's(?) and various other messages. Should I be concerned? again, speed seems to be ok as is the connection. The modem is hooked up to the main cable downstairs with 1 2-way splitter. there is one other splitter in the upstairs bedroom. would replacing the splitters be something to do or is 49-53 within range? thanks again.