Gen 2 offline after re-setting several times

I bought a gen 2 Rachio unit about 2 years ago and it was working smoothly until 2 weeks ago. During this time I had 2 new modems and 2 new network names and it worked perfectly every time I re-set the wifi. But unfortunately 2 weeks ago it went off-line and decided not be alive after more than 10 attempts to re-set. I removed the unit and brought it within 6 inches of the modem as well but the result was same. This was very frustrating and I created a support ticket but never got any support until now and it is more frustrating. I live in other side of the world Sydney, Australia and there is no local support either. Whenever I re-set it it goes back to the original offline position. i.e. keep on flashing of the 4th light. Can somebody please help me before I start regretting about my decision to buy a Rachio unit. Thanks, Mahesh