G series boats with Level 3 stock system

[Kenv]

Just curious, I have a 2015 G21 with the Level 3 stock system with the 4 amps. Everything has worked great for 2 years as far as the speakers. Now, I'm getting a popping noise out of the cockpit speaker behind my drivers seat. Really loud...popping in and out. Started at about 102 hours on the boat. My dealer looks at it this week and says....yeah...it's a voltage issue and 2 batteries are not enough to power your system...we need to add a third battery. ANYONE been told this or experience anything like this. My suggestion is to put two "NEW" batteries in and check it from there. Note: I always run my boat on the #1 or #2 on the Perko.....never on both. I've switched back and forth each time out and never had not one lick of a problem until two years in. Has anyone with this similar system been told Nautique should have put in three batteries to run a system (STOCK POLK Level 3) in any of your boats. Thanks.

[wiggy G23]

Kenv we have same Set up in our 2015 G23 with 325 hours an we dont have that problem first time i have herd anything about a 3rd battery, we have recently had problems with underwater lights flickering while surfing on dusk my dealer said checks volts maybe batterys are getting down as they are into there 3rd season,

[Kenv]

Thanks wiggy. Lights flickering might also be a loose connection somewhere. Always good to have them check everything.