The bottom line for Blink is various results for various people. One of the key problem areas is not good enough wifi signal and/or too much other “stuff” on their current wifi network. You have weak wifi signal and you are being referred via home automation community - that has potential for network conflicts. Buy it from a vendor that has an easy to return in 30 days policy that reflects Blink’s 30 day return policy.
For me, would I buy Blink again? Nope. The reason is shortly after you buy Blink, you realise you want more features/benefits. You will outgrow the entry level Blink solution quickly. Well, that means spending more money for more features/benefits. In the long run, you are better off spending more money up front for a more robust system vs. spending a little money now for Blink, and then spending even more money later for a real security system.