looking for some advice

[ZLB2011]

Hi, I'm looking for some advice and I know you wonderful lot are full of brilliant hints and tips

I'm Mum to my 6 year old son, me and his Dad split up years ago and have always had a rocking relationship making it difficult to approach him about things regarding our soon. Z goes to see his Dad at least 3 times a week but over the past couple of months I have noticed a distinct change in his behavior once he is home. He gets frustrated very easily and has also begun to lash out at me (I've raised my voice at him a few times and sent him to sit on the thinking spot which usually makes the lashing out worse). I've attempted to talk to my son about it but he gets very anxious and gets very upset saying things such as "nobody loves me now" or "Why am I being naughty". I've attempted to approach his Dad but this usually ends up in him telling me I'm lying and making it up. Has anyone got any advice as to what to try next I'm feeling totally lost

My son does something like that after too much screen time. On a couple of occasions he came back from a weekend with his dad, back to school on Monday, and the teachers called to ask what had happened he was so different. Did he spend 10 hours plugged into MineCraft or BeastQuest?
Does his dad have a new girlfriend?
What else is different? Change of diet? Lack of sleep. Is you ex drinking excessively or leaving your son on his own?
For your ex to accuse you of lying at the first pass, sounds as though he knows exactly what is wrong.
All you can do is be calm, consistent and affectionate to ds. When my ds lashed out, I used to diffuse the situation b y tickling him rather than telling him off. And then give him a cuddle.

We've had similar issues with my DS on return from his Dad's (also 6 years old). As Kingsclerelass says ours is linked with too much computer game playing. He has a Nintendo DS at his dads and I get the impression he's on it a lot. Takes a few days for him to resettle.