It's suspicious enough for a formal investigation. Hopefully the investigation is allowed to run it's course so that we can learn what happened. At this point you can neither say there is no connection nor that there is one.
That there are a very large number of very suspicious circumstances is fact. It also appears to be fact that Russia did try to meddle in the election. I don't see any problems with these claims.
A formal investigation isn't unreasonable. The issue is that the investigator (Robert Mueller) has ties to President Trump's political opponents (the Clintons, through James Comey).
As far as Russia meddling in the election, I don't doubt that. What I would dispute is the usual media narrative, that Russia was responsible for releasing the emails from the DNC.
That there are a very large number of very suspicious circumstances is fact. It also appears to be fact that Russia did try to meddle in the election. I don't see any problems with these claims.