I have been struggling with this issue for a while now. I have an Epson all-in-one that is connected to my network wirelessly and to my main pc by usb. After a period of time the printer goes into a low power "standby mode". Separately, after a period of time the printer drops off the network (can't be pinged by any computer, can't be accessed for printing wirelessly). The printer works, in any mode, by usb always.
I originally thought that the "standby mode" triggered the drop off. After much trial and error testing I no longer think that.
I have been in contact with both Epson and TrendNet (the manufacturer of my router). Epson says the issue lies with my router, Trendnet says it lies with the printer. I have done too many settings changes to possibly remember them all.
Long story short: I now believe there is no issue with the printer. Even in standby mode it sends a wireless signal and it's IP is seen by the router. I believe the issue lies with the TrendNet TEW-691GR router. There must be some timeout threshold being met that causes the router to drop the printer off the active list of connections.
The clunky solution is always to either turn off and back on the printer, or to reset the router. But I am sure you, like me, want a more elegant solution. Let me know if you find one.
I have tried:
- giving the printer a fixed IP at the printer level
- giving the printer a fixed IP at the router level
- Upgrading the router's firmware
- Changing the beacon interval
- Playing with the DTIM Interval Settings
- Playing with the RTS THreshold
- Changing the Preamble setting
- Probably several other settings changes I have forgotten
I think tech support at TrendNet threw a small party when I finally gave it up.