It sounds like you're running into power supply failure. I recommend replacing the power supply before considering an upgrade. Here is an article with further information on the issue you are experiencing:
Sling Media Forum Moderation Team
I have had this Slingbox PRO HD for a few years. It has always worked well with only needing a reset every once in a while. All of a sudden it has stopped working and now it won't connect to my network anymore. I cannot reset it, it won't respond to the button. If I plug it in, it has the Sling logo light constantly on and the power light, but no network light on. *** Edited to observe Slingbox Answers Forum House Rules by Moderator. *** If anyone has any tips, please let me know.