UEC6500 WIFI problem

[fresco]

Since few days I have anoying problem.
After turn on TV claims that WIFI card is found and propose me to connect with Samsung Auto Config - after that I push OK and the TV connects with WIFI card ... Connection is terminated after 15-20 s TV shows " WIFI card is disconnected " This happend all over the time.
UEC6500 T-VALDEUC-3015.0 (since dec 2012)
Pentagram WIFI card
TPlink WR1043ND Firmware Version: 3.13.6 Build
For almost 2 years everything was OK. Since dec 2012 nothing was changed in configuration or hardware. I've checked WIFI card - it's OK. The USB 1 and 2 in TV is OK - movies and music from pendrive is played fine.
Please, can you help me solve this problem ?

[juusso]

If nothing changed, then i believe here are some hardware issues. Despite you say here isn`t any.

[fresco]

I bought another wifi card - blueway (there is a sticker - for samsung tv only). I tryed to connect it, but i have still the same problem. C6500 ask me if i want turn on samsung wireless link, and when i press yes, after a few seconds sometimes it try connect with my router and suddenly it ask me if i want turn on samsung wireless link(SWL) on. Im am very confused. Is there any chance to turn on SWL in service menu ? Please help me.

[fresco]

I solved this problem - the reason is ... low power supply from USB. When WIFI is connected to USB Y (2 USB) C6500 gives enough power to operate the web