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I have no experience of wireless speakers but I think you should contact the seller, if the unit is still under warranty or perhaps the support section of the manufacturer's website.
Certainly do read the instrucion manual.
I am guessing but either the wireless signal is being lost (depends on the function of the blue light) or the subwoofer is malfunctioning after a few minutes and the built-in thermal or overload protection is switching it off. The thump sound could be it trying to switch on again and finding the fault is still present.
You will need to take the following steps to ensure that the Vizio wireless subwoofer is working properly:1) You will want to make sure that the subwoofer is in the line of sight of the Vizio sound bar. 2) Ensure the Vizio wireless subwoofer is not beyond 60 ft. away from the sound bar.3) Unplug both the Vizio sound bar and the Vizio wireless subwoofer for 30 seconds and then plug back in.4) Try re-pairing
the devices. Pairing works best when you have the devices facing each
other about a foot apart during initial pairing, once they are paired
you can move them to your desired location.
sorry, but from your description i dont think there is much help for your sub. unless its new and under warranty. that sounds very typical of a dead sub. i have had a bad run in with sony products just quiting only after a few years. i try to stay away from anything with the word sony on it. a short list of the sony products that i can rememdying only after a year or so cd boom box (3 of the same one) sony 19" tv, sony handi cam (video camera two weeks after warranty peroid), component cd player, alarm clock radio.... the list is longer but i will stop. sorry for your trouble.
need more info . what i know is this a subwoofer voice coil gets red hot in color its like the flame on a blowtorch when being played at high volume from the electrical current running through it . when the speaker is brand new you notice the smells like its on fire or burning up . this is normal it just breaking in the speaker . it goes aways few minutes later ...
give me more info into what is happening i can help you
it sounds like one channel in your amp had shorted and letting dc go to the speaker...a speaker is an electromagnet and requires ac to make it pulse..the amp has a blown channel and would have to be repaired and a factory service center...there is no quick fix..