In your case being myself an ex dealer your dac streamer for sure could use a big upgrade
a innuos server,streamer with LPS , your router 100%should have a good LPS the junk wall wart Thst come with modem - router combo are normally 12 v 4 amp
Linear Tube Audio make a exceptional one .buy on Audiogon $50 off $700 none better under $1200 comes too with a great Dc cable to the router.
Linear tube audio , also a quality Ethernet hub ,both need at least a pangea sig or better power cord ,and you wants great dac ,which i am buying soon
the T+A 200 dac,-preamp at $7200 retail beats dacs 2x+ it’s price.
then your system will be substantially better sounding ,that’s a Guarantee !!