How do I check if a part is colliding with another part? (Anchored parts)

I'm trying to figure out an accurate way to determine if an Anchored part is touching any other part. Here is the function I have written so far.

function checkCollisions(part)
    local MIN,MAX,RAN,RAD,FLOOR,ROOF = math.min,math.max,math.random,math.rad,math.floor,math.ceil
    local pos = part.Position
    local size = part.Size
    local startpos = Vector3.new(pos.x-size.x/2,pos.y-size.y/2,pos.z-size.z/2)
    local endpos = Vector3.new(pos.x+size.x/2,pos.y+size.y/2,pos.z+size.z/2)
    local REG3 = Region3.new(Vector3.new(MIN(startpos.X,endpos.X),MIN(startpos.Y,endpos.Y),MIN(startpos.Z,endpos.Z)),Vector3.new(MAX(startpos.X,endpos.X),MAX(startpos.Y,endpos.Y),MAX(startpos.Z,endpos.Z)))
    local partsinREG3 = game.Workspace:FindPartsInRegion3(REG3,nil,1)
    if #partsinREG3 > 0 and partsinREG3[1].Transparency == 0 then
        return partsinREG3[1]
    elseif #partsinREG3 < 1 then
        print(part.Name..' is not colliding with any other object.')
        return false
    end
end

It seems fine, but for some reason, it bugs out and sometimes says that their is a part in range when there isn't.